1. Center for Integrative Human Physiology; Institute of Physiology; University of Zurich; Zurich Switzerland
2. Intensive Care Unit; Department of Internal Medicine; University Hospital; Zurich Switzerland
3. Laboratory for Clinical Cardiovascular Physiology; Department of Internal Medicine; Academic Medical Centre F7N-252; University of Amsterdam; Amsterdam the Netherlands
4. MRC/Arthritis Research UK Centre for Musculoskeletal Ageing Research; School of Biomedical Sciences; Queen's Medical Centre; University of Nottingham Medical School; Nottingham U.K