Michael Westhoff1, Patric Litterst2. 1. Intensive Care and Sleep Medicine, Department of Pneumology, Hemer Lung Clinic Centre of Pneumology and Thoracic Surgery, 58675, Hemer, Germany. woelkewesthoff@aol.com. 2. Intensive Care and Sleep Medicine, Department of Pneumology, Hemer Lung Clinic Centre of Pneumology and Thoracic Surgery, 58675, Hemer, Germany.