An implementation evaluation of the physical activity counseling for in-patients with major depressive disorder (PACINPAT) intervention: a randomized controlled trial oleh Robyn Cody, Jan-Niklas Kreppke, Xenia Fischer, Oliver Faude, Johannes Beck, Serge Brand, Martin Hatzinger, Christian Imboden, Nadine Kügerl, Undine E. Lang, Sarah Mans, Reto Maurer, Thorsten Mikoteit, Anja Oswald, Lilja-Sophie Rhodius, Nina Schweinfurth, Laura Wechsler, Markus Gerber