[1] University Hospital Regensburg,Department of Internal Medicine II
[2] Hospital Helios Dr. Horst Schmidt Kliniken,Department of Pneumology
[3] Bethanien Hospital,Department of Pneumology and Allergology, Center of Sleep Medicine and Respiratory Care
[4] University Hospital Witten/Herdecke,HELIOS
[5] RoMed Clinical Center Rosenheim,Klinik Hagen
[6] Hospital Essen Mitte,Ambrock
[7] Donaustauf Hospital,Department of Internal Medicine III, Division of Pulmonary and Respiratory Medicine