[1] Univ Lleida, Hosp Universitari Arnau Vilanova St Maria, Fac Nursing & Physiotherapy, Dept Nursing & Physiotherapy, Lleida, Spain
[2] Ctr Invest Biomed Red Enfermedades Respiratorias C, Madrid, Spain
[3] Univ Lausanne, Lausanne Univ Hosp, Ctr Invest & Res Sleep, Lausanne, Switzerland
[4] Hosp Universitari Arnau Vilanova St Maria, Translat Res Resp Med, IRBLleida, Lleida, Spain
[5] Hosp Universitari Germans Trias i Pujol, Resp Dept, Barcelona, Spain
[6] Hosp Univ Araba, Serv Invest OSI, IIS Bioaraba, Vitoria-gasteiz, Spain
[7] Hosp Univ Cruces, Serv Neumol, Bizkaia, Spain
[8] Hosp Univ Guadalajara, Resp Dept, Guadalajara, Spain
[9] Univ Autonoma Barcelona, Hosp Universitari Parc Tauli Inst Invest Innovacio, Resp & Sleep Dept, Barcelona, Spain
[10] Hosp Univ Burgos, Resp Dept, Burgos, Spain
[11] Hosp San Pedro Alcantara, Resp Dept, Caceres, Spain
[12] Hosp Univ Son Espases, Inst Invest Sanitaria Palma, Resp Serv, Clin Anal, Palma De Mallorca, Spain
[13] Hosp St Creu i St Pau, Dept Resp Med, Sleep Unit, Barcelona, Spain
[14] Hosp Gen Univ Albacete, Resp Dept, Albacete, Spain
[15] Hosp Clin Barcelona, Resp Dept, Barcelona, Spain
[16] Hosp Universitari St Joan Alacant, Resp Dept, Alicante, Spain
[17] Natl Univ Singapore, Cardiovasc Res Inst, Singapore, Singapore
[18] Flinders Univ S Australia, Adelaide Inst Sleep Hlth, Coll Med & Publ Hlth, Adelaide, SA, Australia
[19] Univ Lausanne, Lausanne Univ Hosp, Pulm Dept, Lausanne, Switzerland