Improving mental health and well-being of hospital staff: mixed-methods process evaluation of the SEEGEN trial - Puschner, Bernd; Stiawa, Maja; Peters, Martin; Angerer, Peter; Rapp, Felicitas; Junne, Florian; Genrich, Melanie; Müller, Andreas; Maatouk, Imad; Helaß, Madeleine; Mulfinger, Nadine; Gündel, Harald (BMC public health, 2025)