Initial severity of depression and efficacy of cognitive-behavioural therapy: Individual-participant data meta-analysis of pill-placebo-controlled trials

Toshi A. Furukawa, Erica S. Weitz, Shiro Tanaka, Steven D. Hollon, Stefan G. Hofmann, Gerhard Andersson, Jos Twisk, Robert J. De Rubeis, Sonas Dimidjian, Ulrich Hegerl, Roland Mergl, Robin B. Jarrett, Jeffrey R. Vittengl, Norio Watanabe, Pim Cuijpers