Bakhsheshian J, Khanna R, Choy W, Lawton CD, Nixon AT, Wong AP, Koski TR, Liu JC, Song JK, Dahdaleh NS, Smith ZA, Fessler RG. Incidence of graft extrusion following minimally invasive transforaminal lumbar interbody fusion. J Clin Neurosci. 2016 Feb; 24:88-93.