[1] Pontificia Univ Catolica Chile, Sch Med, Dept Digest Surg, Santiago, Chile
[2] Univ Buenos Aires, Sch Med, Dept Physiol, IFIBIO Houssay, Buenos Aires, Argentina
[3] Ctr Diagnost San Jorge, Puerto Madryn, Chubut, Argentina
[4] Inst Nacl Enfermedades Resp Dr Emilio Coni ANLIS, Santa Fe, Argentina
[5] Inst Salud Dr Carlos Malbran, Santa Fe, Argentina
[6] UCA, Chronophysiol Lab, Inst Biomed Res, CONICET, Buenos Aires, Argentina
[7] Araba Univ Hosp, Osakidetza Basque Hlth Serv, Sleep Unit, Vitoria, Spain
[8] Univ Austral, Hosp Univ Austral, Pulm Med, Pilar, Argentina