[1] Univ Hosp Heraklion, Dept Internal Med, Iraklion, Greece
[2] Univ Crete, Fac Med, Dept Social Med, Iraklion, Greece
[3] Univ Hosp Heraklion, Dept Otorhinolaryngol, Iraklion, Greece
[4] Gen Hosp Sitia, Dept Paediat, Sitia, Greece
[5] European Univ Cyprus, Sch Med, 6 Diogenes Str, CY-2404 Nicosia, Cyprus