[1] Sahlgrens Univ Hosp, Dept Sleep Med, Gothenburg, Sweden
[2] Gothenburg Univ, Sahlgrenska Acad, Ctr Sleep & Vigilance Disorders, Medicinaregatan 8B,Box 421, S-40530 Gothenburg, Sweden
[3] Univ Palermo, Promise Dept, Palermo, Italy
[4] St Lukes Hosp, Dept Cardiovasc Neural & Metab Sci, IRCCS, Ist Auxol Italiano, Milan, Italy
[5] Univ Milano Bicocca, Dept Med & Surg, Milan, Italy
[6] Masaryk Univ, Univ Hosp Brno, Dept Internal Geriatr & Pract Med, Brno, Czech Republic
[7] Masaryk Univ, Med Fac, Brno, Czech Republic