PUB19
Wu, Y., Levis, B., Riehm, K. E., Saadat, N., Levis, A. W., Azar, M., … & Ioannidis, J. P. (2019). Equivalency of the diagnostic accuracy of the PHQ-8 and PHQ-9: a systematic review and individual participant data meta-analysis. Psychological medicine, 1-13.