1. Department of Internal Medicine II University Hospital Regensburg Regensburg Germany
2. Ludgerus‐Kliniken Münster, Clemenshospital Münster Germany
3. ResMed Science Center Martinsried Germany
4. Clinic III for Internal Medicine Heart Center University Hospital Cologne Cologne Germany
5. Department of Pneumology, Ruhrlandklinik, West German Lung Center, University Hospital Essen University Duisburg‐Essen Essen Germany
6. Sleep and Ventilation Center Blaubeuren Lung Center Ulm Ulm Germany