[1] Natl & Kapodistrian Univ Athens, Dept Hyg Epidemiol & Med Stat, Med Sch, 75 M Asias Str, Athens 11527, Greece
[2] Laikon Gen Hosp, Emergency Care Dept, Athens 11527, Greece
[3] Univ Athens, Dept Cardiol 1, Hippokrat Gen Hosp, Med Sch, Athens 11527, Greece
[4] Univ Athens, Dept Cardiol 3, Thorac Dis Gen Hosp Sotiria, Med Sch, Athens 11527, Greece
[5] Natl & Kapodistrian Univ Athens, Laiko Gen Hosp, Dept Propedeut Surg 2, Med Sch, Athens 11527, Greece
[6] Natl & Kapodistrian Univ Athens, NS Christeas Lab Expt Surg & Surg Res, Med Sch, Athens 11527, Greece
[7] Natl & Kapodistrian Univ Athens, Laiko Gen Hosp, Dept Propedeut Internal Med 1, Med Sch, Athens 11527, Greece
[8] Univ Thessaly, Fac Med, Dept Hyg & Epidemiol, Larisa 41500, Greece
[9] Hlth Ctr Nea Makri, Attica 19005, Greece
[10] Natl & Kapodistrian Univ Athens, Laikon Gen Hosp, Dept Surg 1, Athens 11527, Greece
[11] Laikon Gen Hosp, Renal Transplantat Unit, Athens 11527, Greece