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Is there an “unhealthy volunteer effect” in mental health outpatient research?
Zivin, Kara
; Pfeiffer, P N; Szymanski, B; Dhawan, N; DiFranco, D; Valenstein, M. (2010).
Is there an "unhealthy volunteer effect" in mental health outpatient research?
. Psychiatry Research. 176(2-3), 224-228.