1. Center of Psychosocial Medicine, Department of Medical Psychology; University Medical Center Hamburg-Eppendorf; Germany
2. HELIOS-Rehabilitation Clinic Lehmrade GmbH; Lehmrade; Germany
3. HELIOS-Rehabilitation Clinic Schloss Schönhagen GmbH; Brodersby; Germany
4. HELIOS-Rehabilitation Clinic Ahrenshoop GmbH; Ostseebad Ahrenshoop; Germany