1. Hatter Institute for Cardiovascular Research in Africa (HICRA) and MRC Inter-University Cape Heart Group, Department of Medicine, Faculty of Health Sciences; University of Cape Town; Cape Town South Africa
2. Institute of Physiology; Justus Liebig University Giessen; Giessen Germany
3. Universities of Giessen and Marburg Lung Centre, Member of the German Lung Centre (DZL); Justus Liebig University Giessen; Giessen Germany