Variability in negative emotions among individuals with chronic low back pain: relationships with pain and function.
Gerhart JI, Burns JW, Bruehl S, Smith DA, Post KM, Porter LS, Schuster E, Buvanendran A, Fras AM, Keefe FJ. Variability in negative emotions among individuals with chronic low back pain: relationships with pain and function. Pain. 2018 02; 159(2):342-350.