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Kern Singh to Adult

This is a "connection" page, showing publications Kern Singh has written about Adult.
Connection Strength

5.131
  1. Preliminary Evaluation of Standing Full-Length Plain Radiographs Utility in an Adult Degenerative Spine Practice. J Am Acad Orthop Surg. 2022 Feb 01; 30(3):e348-e360.
    View in: PubMed
    Score: 0.079
  2. Preoperative Physical Function Association With Mental Health Improvement After Anterior Cervical Discectomy and Fusion. Clin Spine Surg. 2021 12 01; 34(10):E559-E565.
    View in: PubMed
    Score: 0.078
  3. Single-Level Minimally Invasive Transforaminal Lumbar Interbody Fusion versus Anterior Lumbar Interbody Fusion with Posterior Instrumentation at L5/S1. World Neurosurg. 2022 01; 157:e111-e122.
    View in: PubMed
    Score: 0.077
  4. The Effect of the Severity of Preoperative Back Pain on Patient-Reported Outcomes, Recovery Ratios, and Patient Satisfaction Following Minimally Invasive Transforaminal Lumbar Interbody Fusion (MIS-TLIF). World Neurosurg. 2021 12; 156:e254-e265.
    View in: PubMed
    Score: 0.077
  5. Impact of Advanced Age on Postoperative Outcomes Following Transforaminal Lumbar Interbody Fusion. J Am Acad Orthop Surg. 2021 Sep 01; 29(17):e869-e879.
    View in: PubMed
    Score: 0.077
  6. Validation of VR-12 Physical Function in Minimally Invasive Lumbar Discectomy. World Neurosurg. 2021 11; 155:e362-e368.
    View in: PubMed
    Score: 0.076
  7. Multimodal Analgesic Management for Lumbar Decompression Surgery in the Ambulatory Setting: Clinical Case Series and Review of the Literature. World Neurosurg. 2021 10; 154:e656-e664.
    View in: PubMed
    Score: 0.076
  8. Achievement of a Minimum Clinically Important Difference for Back Disability Is a Suitable Predictor of Patient Satisfaction Among Lumbar Fusion Patients. World Neurosurg. 2021 08; 152:e94-e100.
    View in: PubMed
    Score: 0.075
  9. The Minimum Clinically Important Difference for Patient Health Questionnaire-9 in Minimally Invasive Transforaminal Interbody Fusion. Spine (Phila Pa 1976). 2021 May 01; 46(9):603-609.
    View in: PubMed
    Score: 0.075
  10. A Validation of Patient Health Questionnaire-9 for Cervical Spine Surgery. Spine (Phila Pa 1976). 2020 Dec 01; 45(23):1668-1675.
    View in: PubMed
    Score: 0.073
  11. Validation of PROMIS Physical Function in MIS TLIF: 2-Year Follow-up. Spine (Phila Pa 1976). 2020 Nov 15; 45(22):E1516-E1522.
    View in: PubMed
    Score: 0.072
  12. Patient Perceptions of Physician Ownership in Spine Care. Clin Spine Surg. 2020 10; 33(8):E369-E375.
    View in: PubMed
    Score: 0.072
  13. Postoperative Pain, Narcotics Consumption, and Patient-Reported Outcomes Based on PROMIS Physical Function Following a Single-Level Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976). 2020 Sep 01; 45(17):E1091-E1096.
    View in: PubMed
    Score: 0.071
  14. The Impact of Comorbidity Burden on Postoperative PROMIS Physical Function Following Minimally Invasive Transforaminal Lumbar Interbody Fusion. Clin Spine Surg. 2020 07; 33(6):E294-E298.
    View in: PubMed
    Score: 0.071
  15. Validity of Patient Health Questionnaire-9 in Minimally Invasive Lumbar Interbody Fusion. Spine (Phila Pa 1976). 2020 Jun 01; 45(11):E663-E669.
    View in: PubMed
    Score: 0.070
  16. All Disclosure is Good Disclosure: Patient Awareness of the Sunshine Act and Perceptions of Surgeon-Industry Relationships. Clin Spine Surg. 2020 04; 33(3):E96-E100.
    View in: PubMed
    Score: 0.069
  17. The Influence of Preoperative Mental Health on PROMIS Physical Function Outcomes Following Minimally Invasive Transforaminal Lumbar Interbody Fusion. Spine (Phila Pa 1976). 2020 Feb 15; 45(4):E236-E243.
    View in: PubMed
    Score: 0.069
  18. Sex Differences on Postoperative Pain and Disability Following Minimally Invasive Lumbar Discectomy. Clin Spine Surg. 2019 12; 32(10):E444-E448.
    View in: PubMed
    Score: 0.068
  19. The Use of Patient-Reported Outcome Measurement Information System Physical Function to Predict Outcomes Based on Body Mass Index Following Minimally Invasive Transforaminal Lumbar Interbody Fusion. Spine (Phila Pa 1976). 2019 Dec 01; 44(23):E1388-E1395.
    View in: PubMed
    Score: 0.068
  20. Safety and Efficacy of Revision Minimally Invasive Lumbar Decompression in the Ambulatory Setting. Spine (Phila Pa 1976). 2019 Apr 15; 44(8):E494-E499.
    View in: PubMed
    Score: 0.065
  21. PROMIS Physical Function Score Strongly Correlates With Legacy Outcome Measures in Minimally Invasive Lumbar Microdiscectomy. Spine (Phila Pa 1976). 2019 03 15; 44(6):442-446.
    View in: PubMed
    Score: 0.064
  22. Risk Factors for a Long Hospital Stay Following Minimally Invasive Lumbar Discectomy. Clin Spine Surg. 2019 02; 32(1):E56-E59.
    View in: PubMed
    Score: 0.064
  23. The Effect of Preoperative Symptom Duration on Postoperative Outcomes After a Tubular Lumbar Microdiscectomy. Clin Spine Surg. 2019 02; 32(1):E27-E30.
    View in: PubMed
    Score: 0.064
  24. Comparison of Postoperative Outcomes Between Primary MIS TLIF and MIS TLIF With Revision Decompression. Spine (Phila Pa 1976). 2019 Jan 15; 44(2):150-156.
    View in: PubMed
    Score: 0.064
  25. Impact of local steroid application in a minimally invasive transforaminal lumbar interbody fusion: results of a prospective, randomized, single-blind trial. J Neurosurg Spine. 2018 11 09; 30(2):222-227.
    View in: PubMed
    Score: 0.063
  26. Iliac Crest Bone Graft for Minimally Invasive Transforaminal Lumbar Interbody Fusion: A Prospective Analysis of Inpatient Pain, Narcotics Consumption, and Costs. Spine (Phila Pa 1976). 2018 09 15; 43(18):1307-1312.
    View in: PubMed
    Score: 0.062
  27. Sex Differences for Anterior Cervical Fusion: Complications and Length of Stay. Spine (Phila Pa 1976). 2018 08 01; 43(15):1025-1030.
    View in: PubMed
    Score: 0.062
  28. Does Day of Surgery Affect Hospital Length of Stay and Charges Following Minimally Invasive Transforaminal Lumbar Interbody Fusion? Clin Spine Surg. 2018 06; 31(5):E291-E295.
    View in: PubMed
    Score: 0.061
  29. Patient Perceptions of Minimally Invasive Versus Open Spine Surgery. Clin Spine Surg. 2018 04; 31(3):E184-E192.
    View in: PubMed
    Score: 0.060
  30. Variation in Spine Surgeon Selection Criteria Between Neurosurgery and Orthopedic Surgery Patients. Clin Spine Surg. 2018 03; 31(2):E127-E132.
    View in: PubMed
    Score: 0.060
  31. Risk Factors Associated With Failure to Reach Minimal Clinically Important Difference in Patient-reported Outcomes Following Minimally Invasive Transforaminal Lumbar Interbody Fusion for Spondylolisthesis. Clin Spine Surg. 2018 02; 31(1):E92-E97.
    View in: PubMed
    Score: 0.060
  32. Radiographic Analysis of Psoas Morphology and its Association With Neurovascular Structures at L4-5 With Reference to Lateral Approaches. Spine (Phila Pa 1976). 2017 Dec 15; 42(24):E1386-E1392.
    View in: PubMed
    Score: 0.059
  33. Preoperative Mental Health is not Predictive of Patient-reported Outcomes Following a Minimally Invasive Lumbar Discectomy. Clin Spine Surg. 2017 Dec; 30(10):E1388-E1391.
    View in: PubMed
    Score: 0.059
  34. The Utility of Routinely Obtaining Postoperative Laboratory Studies Following a Minimally Invasive Transforaminal Lumbar Interbody Fusion. Clin Spine Surg. 2017 Dec; 30(10):E1405-E1410.
    View in: PubMed
    Score: 0.059
  35. Narcotic Consumption Following Anterior and Lateral Lumbar Interbody Fusion Procedures. Clin Spine Surg. 2017 Nov; 30(9):E1190-E1200.
    View in: PubMed
    Score: 0.059
  36. Comparison of Surgical Outcomes, Narcotics Utilization, and Costs After an Anterior Cervical Discectomy and Fusion: Stand-alone Cage Versus Anterior Plating. Clin Spine Surg. 2017 Nov; 30(9):E1201-E1205.
    View in: PubMed
    Score: 0.059
  37. Improvements in Neck and Arm Pain Following an Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976). 2017 Jul 15; 42(14):E825-E832.
    View in: PubMed
    Score: 0.057
  38. Spinal Surgeon Variation in Single-Level Cervical Fusion Procedures: A Cost and Hospital Resource Utilization Analysis. Spine (Phila Pa 1976). 2017 Jul 01; 42(13):1031-1038.
    View in: PubMed
    Score: 0.057
  39. Neuroforaminal Bone Growth Following Minimally Invasive Transforaminal Lumbar Interbody Fusion With BMP: A Computed Tomographic Analysis. Clin Spine Surg. 2017 Jul; 30(6):E754-E758.
    View in: PubMed
    Score: 0.057
  40. Effect of Surgeon Volume on Complications, Length of Stay, and Costs Following Anterior Cervical Fusion. Spine (Phila Pa 1976). 2017 Mar 15; 42(6):394-399.
    View in: PubMed
    Score: 0.056
  41. Lumbar Spine Injuries in the Athlete. Instr Course Lect. 2017 Feb 15; 66:403-408.
    View in: PubMed
    Score: 0.056
  42. Malnutrition Predicts Infectious and Wound Complications Following Posterior Lumbar Spinal Fusion. Spine (Phila Pa 1976). 2016 Nov 01; 41(21):1693-1699.
    View in: PubMed
    Score: 0.055
  43. Anterior Cervical Discectomy and Fusion: The Surgical Learning Curve. Spine (Phila Pa 1976). 2016 Oct 15; 41(20):1580-1585.
    View in: PubMed
    Score: 0.055
  44. Patient knowledge regarding radiation exposure from spinal imaging. Spine J. 2017 03; 17(3):305-312.
    View in: PubMed
    Score: 0.054
  45. Spine Surgeon Selection Criteria: Factors Influencing Patient Choice. Spine (Phila Pa 1976). 2016 Jul 01; 41(13):E814-E819.
    View in: PubMed
    Score: 0.053
  46. Functional Capacity Evaluation Following Spinal Fusion Surgery. Spine (Phila Pa 1976). 2016 Jul 01; 41(13):1104-1110.
    View in: PubMed
    Score: 0.053
  47. Multimodal Versus Patient-Controlled Analgesia After an Anterior Cervical Decompression and Fusion. Spine (Phila Pa 1976). 2016 Jun; 41(12):994-998.
    View in: PubMed
    Score: 0.053
  48. Incidence and Risk Factors for Pneumonia After Posterior Lumbar Fusion Procedures: An ACS-NSQIP Study. Spine (Phila Pa 1976). 2016 Jun; 41(12):1058-1063.
    View in: PubMed
    Score: 0.053
  49. Does Greater Body Mass Index Increase the Risk for Revision Procedures Following a Single-Level Minimally Invasive Lumbar Discectomy? Spine (Phila Pa 1976). 2016 May; 41(9):816-21.
    View in: PubMed
    Score: 0.053
  50. Incidence and risk factors for pneumonia following anterior cervical decompression and fusion procedures: an ACS-NSQIP study. Spine J. 2016 Mar; 16(3):335-42.
    View in: PubMed
    Score: 0.051
  51. Urinary Tract Infection Following Posterior Lumbar Fusion Procedures: An American College of Surgeons National Surgical Quality Improvement Program Study. Spine (Phila Pa 1976). 2015 Nov; 40(22):1785-91.
    View in: PubMed
    Score: 0.051
  52. Primary Versus Revision Single-level Minimally Invasive Lumbar Discectomy: Analysis of Clinical Outcomes and Narcotic Utilization. Spine (Phila Pa 1976). 2015 Sep 15; 40(18):E1025-30.
    View in: PubMed
    Score: 0.051
  53. Preoperative narcotic utilization: accuracy of patient self-reporting and its association with postoperative narcotic consumption. J Neurosurg Spine. 2016 Jan; 24(1):206-14.
    View in: PubMed
    Score: 0.051
  54. Postoperative Narcotic Consumption in Workman's Compensation Patients Following a Minimally Invasive Transforaminal Lumbar Interbody Fusion. Spine (Phila Pa 1976). 2015 Aug 15; 40(16):1284-8.
    View in: PubMed
    Score: 0.050
  55. Minimally invasive lumbar decompression-the surgical learning curve. Spine J. 2016 08; 16(8):909-16.
    View in: PubMed
    Score: 0.050
  56. The Impact of Worker's Compensation Claims on Outcomes and Costs Following an Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976). 2015 Jun 15; 40(12):948-53.
    View in: PubMed
    Score: 0.050
  57. The utility of obtaining routine hematological laboratory values following an anterior cervical diskectomy and fusion. Spine (Phila Pa 1976). 2014 Sep 15; 39(20):E1228-32.
    View in: PubMed
    Score: 0.047
  58. Cost analysis of incidental durotomy in spine surgery. Spine (Phila Pa 1976). 2014 Aug 01; 39(17):E1042-51.
    View in: PubMed
    Score: 0.047
  59. Sentinel events in cervical spine surgery. Spine (Phila Pa 1976). 2014 Apr 20; 39(9):715-20.
    View in: PubMed
    Score: 0.046
  60. Incidence, risk factors, and outcomes of postoperative airway management after cervical spine surgery. Spine (Phila Pa 1976). 2014 Apr 20; 39(9):E557-63.
    View in: PubMed
    Score: 0.046
  61. Cerebral vascular accidents after lumbar spine fusion. Spine (Phila Pa 1976). 2014 Apr 15; 39(8):673-7.
    View in: PubMed
    Score: 0.046
  62. Comparison of revision surgeries for one- to two-level cervical TDR and ACDF from 2002 to 2011. Spine J. 2014 Dec 01; 14(12):2841-6.
    View in: PubMed
    Score: 0.046
  63. Perioperative characteristics and outcomes of patients undergoing anterior cervical fusion in July: analysis of the "July effect". Spine (Phila Pa 1976). 2014 Apr 01; 39(7):612-7.
    View in: PubMed
    Score: 0.046
  64. Current trends in demographics, practice, and in-hospital outcomes in cervical spine surgery: a national database analysis between 2002 and 2011. Spine (Phila Pa 1976). 2014 Mar 15; 39(6):476-81.
    View in: PubMed
    Score: 0.046
  65. Prospective, randomized, controlled trial of silicate-substituted calcium phosphate versus rhBMP-2 in a minimally invasive transforaminal lumbar interbody fusion. Spine (Phila Pa 1976). 2014 Feb 01; 39(3):185-91.
    View in: PubMed
    Score: 0.045
  66. Comparison between cervical total disc replacement and anterior cervical discectomy and fusion of 1 to 2 levels from 2002 to 2009. Spine (Phila Pa 1976). 2014 Jan 01; 39(1):53-7.
    View in: PubMed
    Score: 0.045
  67. Comparison of perioperative outcomes and cost of spinal fusion for cervical trauma: weekday versus weekend admissions. Spine (Phila Pa 1976). 2013 Dec 01; 38(25):2178-83.
    View in: PubMed
    Score: 0.045
  68. A perioperative cost analysis comparing single-level minimally invasive and open transforaminal lumbar interbody fusion. Spine J. 2014 Aug 01; 14(8):1694-701.
    View in: PubMed
    Score: 0.045
  69. Incidence and risk factors for perioperative visual loss after spinal fusion. Spine J. 2014 Sep 01; 14(9):1866-72.
    View in: PubMed
    Score: 0.045
  70. Incidence and risk factors for postoperative ileus following anterior, posterior, and circumferential lumbar fusion. Spine J. 2014 Aug 01; 14(8):1680-5.
    View in: PubMed
    Score: 0.044
  71. Minimally invasive transforaminal lumbar interbody fusion: one surgeon's learning curve. Spine J. 2014 Aug 01; 14(8):1460-5.
    View in: PubMed
    Score: 0.044
  72. Incidence and risk factors for dysphagia after anterior cervical fusion. Spine (Phila Pa 1976). 2013 Oct 01; 38(21):1820-5.
    View in: PubMed
    Score: 0.044
  73. Incidence and risk factors for postoperative delirium after lumbar spine surgery. Spine (Phila Pa 1976). 2013 Sep 15; 38(20):1790-6.
    View in: PubMed
    Score: 0.044
  74. Incidence, risk factors, and mortality associated with aspiration in cervical spine surgery. Spine (Phila Pa 1976). 2013 Sep 01; 38(19):E1189-95.
    View in: PubMed
    Score: 0.044
  75. Clinical sequelae after rhBMP-2 use in a minimally invasive transforaminal lumbar interbody fusion. Spine J. 2013 Sep; 13(9):1118-25.
    View in: PubMed
    Score: 0.044
  76. Incidence and risk factors for gastrointestinal hemorrhage after lumbar fusion. Spine (Phila Pa 1976). 2013 Aug 15; 38(18):1584-9.
    View in: PubMed
    Score: 0.044
  77. Incidence and mortality of cardiac events in lumbar spine surgery. Spine (Phila Pa 1976). 2013 Jul 15; 38(16):1422-9.
    View in: PubMed
    Score: 0.044
  78. Incidence and mortality of perioperative cardiac events in cervical spine surgery. Spine (Phila Pa 1976). 2013 Jul 01; 38(15):1268-74.
    View in: PubMed
    Score: 0.043
  79. The incidence and mortality of thromboembolic events in lumbar spine surgery. Spine (Phila Pa 1976). 2013 Jun 01; 38(13):1154-9.
    View in: PubMed
    Score: 0.043
  80. The incidence and mortality of thromboembolic events in cervical spine surgery. Spine (Phila Pa 1976). 2013 Apr 20; 38(9):E521-7.
    View in: PubMed
    Score: 0.043
  81. Predictive factors of hospital stay in patients undergoing minimally invasive transforaminal lumbar interbody fusion and instrumentation. Spine (Phila Pa 1976). 2012 Nov 15; 37(24):2046-54.
    View in: PubMed
    Score: 0.042
  82. A comparison of perioperative costs and outcomes in patients with and without workers' compensation claims treated with minimally invasive or open transforaminal lumbar interbody fusion. Spine (Phila Pa 1976). 2012 Oct 15; 37(22):1914-9.
    View in: PubMed
    Score: 0.041
  83. Lumbar extracavitary corpectomy with a single stage circumferential arthrodesis: surgical technique and clinical series. Am J Orthop (Belle Mead NJ). 2012 Jul; 41(7):316-20.
    View in: PubMed
    Score: 0.041
  84. Factors affecting reoperations after anterior cervical discectomy and fusion within and outside of a Federal Drug Administration investigational device exemption cervical disc replacement trial. Spine J. 2012 May; 12(5):372-8.
    View in: PubMed
    Score: 0.040
  85. Minimally invasive thoracolumbar corpectomy and reconstruction. Orthopedics. 2012 Jan 16; 35(1):e74-9.
    View in: PubMed
    Score: 0.039
  86. Age-related changes in the extracellular matrix of nucleus pulposus and anulus fibrosus of human intervertebral disc. Spine (Phila Pa 1976). 2009 Jan 01; 34(1):10-6.
    View in: PubMed
    Score: 0.032
  87. A prospective, randomized, double-blind study of the efficacy of postoperative continuous local anesthetic infusion at the iliac crest bone graft site after posterior spinal arthrodesis: a minimum of 4-year follow-up. Spine (Phila Pa 1976). 2007 Dec 01; 32(25):2790-6.
    View in: PubMed
    Score: 0.029
  88. Unusual presentation of a paraspinal mass with involvement of a lumbar facet joint and the epidural space. Orthopedics. 2006 03; 29(3):265-7.
    View in: PubMed
    Score: 0.026
  89. A prospective, randomized, double-blind study evaluating the efficacy of postoperative continuous local anesthetic infusion at the iliac crest bone graft site after spinal arthrodesis. Spine (Phila Pa 1976). 2005 Nov 15; 30(22):2477-83.
    View in: PubMed
    Score: 0.026
  90. Congenital lumbar spinal stenosis: a prospective, control-matched, cohort radiographic analysis. Spine J. 2005 Nov-Dec; 5(6):615-22.
    View in: PubMed
    Score: 0.026
  91. Management of Anticoagulation/Antiplatelet Medication and Venous Thromboembolism Prophylaxis in Elective Spine Surgery: Concise Clinical Recommendations Based on a Modified Delphi Process. Spine (Phila Pa 1976). 2023 Mar 01; 48(5):301-309.
    View in: PubMed
    Score: 0.021
  92. Early Opioid Consumption Patterns After Anterior Cervical Spine Surgery. Clin Spine Surg. 2022 02 01; 35(1):E121-E126.
    View in: PubMed
    Score: 0.020
  93. Long structural allografts in the treatment of anterior spinal column defects. Clin Orthop Relat Res. 2002 Jan; (394):121-9.
    View in: PubMed
    Score: 0.020
  94. Minimal Clinically Important Difference and Substantial Clinical Benefit Using PROMIS CAT in Cervical Spine Surgery. Clin Spine Surg. 2019 11; 32(9):392-397.
    View in: PubMed
    Score: 0.017
  95. Predictive Factors of Postoperative Dysphagia in Single-Level Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976). 2019 04 01; 44(7):E400-E407.
    View in: PubMed
    Score: 0.016
  96. Incidence, Risk Factors, and Impact of Clostridium difficile Colitis After Spine Surgery: An Analysis of a National Database. Spine (Phila Pa 1976). 2018 06 15; 43(12):861-868.
    View in: PubMed
    Score: 0.015
  97. Longer Operative Time Is Associated With Increased Adverse Events After Anterior Cervical Diskectomy and Fusion: 15-Minute Intervals Matter. Orthopedics. 2018 Jul 01; 41(4):e483-e488.
    View in: PubMed
    Score: 0.015
  98. Severity Weighting of Postoperative Adverse Events in Orthopedic Surgery. Am J Orthop (Belle Mead NJ). 2017 Jul/Aug; 46(4):E235-E243.
    View in: PubMed
    Score: 0.014
  99. Differences in Short-Term Outcomes Between Primary and Revision Anterior Cervical Discectomy and Fusion. Spine (Phila Pa 1976). 2017 Feb 15; 42(4):253-260.
    View in: PubMed
    Score: 0.014
  100. Primary and Revision Posterior Lumbar Fusion Have Similar Short-Term Complication Rates. Spine (Phila Pa 1976). 2016 Jan; 41(2):E101-6.
    View in: PubMed
    Score: 0.013
  101. Timing of Complications After Spinal Fusion Surgery. Spine (Phila Pa 1976). 2015 Oct 01; 40(19):1527-35.
    View in: PubMed
    Score: 0.013
  102. Mesenchymal stem cell allograft as a fusion adjunct in one- and two-level anterior cervical discectomy and fusion: a matched cohort analysis. Spine J. 2016 Feb; 16(2):163-7.
    View in: PubMed
    Score: 0.012
  103. Patient perceptions of physician reimbursement for spine surgery. Spine (Phila Pa 1976). 2013 Jul 01; 38(15):1288-93.
    View in: PubMed
    Score: 0.011
  104. Increased swelling complications associated with off-label usage of rhBMP-2 in the anterior cervical spine. Spine (Phila Pa 1976). 2006 Nov 15; 31(24):2813-9.
    View in: PubMed
    Score: 0.007
  105. Comparing outcomes of anterior cervical discectomy and fusion in workman's versus non-workman's compensation population. Spine J. 2002 Nov-Dec; 2(6):408-14.
    View in: PubMed
    Score: 0.005
Connection Strength

The connection strength for concepts is the sum of the scores for each matching publication.

Publication scores are based on many factors, including how long ago they were written and whether the person is a first or senior author.