[1] Univ Hosp Ioannina, Fac Med, Ioannina, Greece
[2] Imperial Coll London, Sch Publ Hlth, Dept Primary Care & Publ Hlth, Imperial Ctr Cardiovascular Dis Prevent, London, England
[3] Democritus Univ Thrace, Dept Internal Med 2, Ctr Diabet, Alexandroupolis, Greece
[4] Natl & Kapodistrian Univ Athens, Sch Med, Laiko Hosp, Propaedeut Dept Med 1, Athens, Greece
[5] Univ Ioannina, Sch Hlth Sci, Fac Med, Dept Cardiol 2, Ioannina, Greece
[6] Univ Hosp Ioannina, Ioannina, Greece
[7] Gen Hosp Nikaia Piraeus Agios Panteleimon, Dept Nephrol, Athens, Greece