[1] Univ Gen Hosp Patras, Div Internal Med, Patras 26504, Greece
[2] Univ Patras, Sch Med, Patras 26504, Greece
[3] Aristotle Univ Thessaloniki, Univ Hosp Thessaloniki, AHEPA, Med Propedeut Dept Internal Med 1, Thessaloniki 54124, Greece
[4] Univ Gen Hosp Patras, Dept Pulmonol, Patras 26504, Greece