1. Department of Pulmonary Medicine and Allergology, Inselspital Bern University Hospital, University of Bern Bern Switzerland
2. Department of Visceral Surgery and Medicine, Inselspital Bern University Hospital, University of Bern Bern Switzerland
3. Department of Cardiology, Inselspital Bern University Hospital, University of Bern Bern Switzerland
4. Department of Human and Translational Medicine, School of Medicine University of Namibia Windhoek Namibia