1 Department of General Internal Medicine, Division of Psychosomatic Medicine, Inselspital, Bern University Hospital, 3010 Bern, Switzerland.
2 Institute of Medical Biostatistics, Epidemiology, and Informatics, University Medical Center of the Johannes Gutenberg University, Mainz, Obere Zahlbacher Straße 69, 55131 Mainz, Germany.
3 Heart Failure and Transplantation, Department of Cardiology, Inselspital, Bern University Hospital, 3010 Bern, Switzerland.
4 Department of Psychosomatic Medicine, Clinic Barmelweid, 5017 Barmelweid, Switzerland; Department of Neurology, Inselspital, Bern University Hospital, 3010 Bern, Switzerland.