Evaluating a multimodal, clinical and work-directed intervention (RTW-PIA) to support sustainable return to work among employees with mental disorders: study protocol of a multicen... oleh Fiona Starke, Alexandra Sikora, Ralf Stegmann, Leonie Knebel, Claudia Buntrock, Angelique de Rijk, Inge Houkes, Gregor R. Szycik, Hans-Peter Unger, Jan Ole Schumacher, Heiko Stark, Iris Hauth, Christian Holzapfel, Anna Borgolte, Carlotta Schneller, Sarah-Louise Unterschemmann, Wiebke Paetow, Anna Lena Jung, Matthias Berking, Johannes Zimmermann, Uta Wegewitz