[1] Univ Antwerp Hosp, Dept Pulm Med, Edegem, Belgium
[2] Univ Antwerp Hosp, Dept Pneumol, Edegem, Belgium
[3] Royal Brompton & Harefield NHS Fdn Trust, Acad Unit Sleep & Breathing, London, England
[4] Univ London Imperial Coll Sci Technol & Med, Natl Heart & Lung Inst, Clin & Acad Unit Sleep & Breathing, London, England
[5] Aintree Univ Hosp NHS Fdn Trust, Ctr Clin Sci, Dept Med, Liverpool L9 7AL, Merseyside, England
[6] Royal Infirm Edinburgh NHS Trust, Dept Sleep Med, Edinburgh, Midlothian, Scotland
[7] ERS Headquarters, Lausanne, Switzerland
[8] Lungenfachklin Immenhausen, Immenhausen, Germany
[9] Univ Witten Herdecke, Inst Pneumol, Bethanien Hosp, Solingen, Germany
[10] Univ Palermo, Resp Sect, Biomed Dept Internal & Specialist Med DIBIMIS, Palermo, Italy
[11] Univ Roma La Sapienza, Dipartimento Med Clin, Rome, Italy
[12] Safarik Univ, Fac Med, Dept Physiol & Sleep Lab, Kosice, Slovakia
[13] Univ Grenoble 1, Fac Med, INSERM, Lab HP2,Unit 1042, Grenoble, France
[14] Grenoble Univ Hosp, Rehabil & Physiol Dept, Sleep Lab, Grenoble, France
[15] Univ Paris, Dept Physiol, F-75252 Paris, France
[16] St Vincents Univ Hosp, Resp Sleep Disorders Unit, Dublin 4, Ireland