1 Bethanien Hospital, Clinic for Pneumology and Allergology, Centre of Sleep Medicine and Respiratory Care, Aufderhöher Str. 169, 42699 Solingen, Germany. Electronic address: [email protected].
2 Sleep Heart Program, The Ohio State University, Columbus, OH, USA.
3 Department of Internal Medicine II, University Hospital Regensburg, Germany.
4 Bethesda North Hospital, Professor Emeritus, University of Cincinnati, Cincinnati, Ohio, USA.