1. Centre de Médecine du Sommeil; Hôpital Béclère; Clamart France
2. Sleep Disorder Center; Pulmonary Medicine; Sahlgrenska University Hospital; Gothenburg Sweden
3. Charité - Universitaetsmedizin Berlin; Schlafmedizinisches Zentrum; Berlin Germany
4. Pulmonary and Sleep Disorders Unit; St. Vincent's University Hospital; School of Medicine and Medical Science; University College Dublin; Dublin Ireland
5. Pulmonary Medicine and Multidisciplinary Sleep Disorders Centre; Antwerp University Hospital and University of Antwerp; Edegem Belgium
6. Department of Respiratory Medicine; Faculty of Medicine; P.J. Safarik University and L. Pasteur Teaching Hospital; Kosice Slovakia
7. Department of Sleep Medicine; Royal Infirmary of Edinburgh; Edinburgh UK