[1] Aristotle Univ Thessaloniki, Propedeut Dept Internal Med 2, Gen Hosp Hippokrat, Thessaloniki, Greece
[2] Natl & Kapodistrian Univ Athens, Hippokrat Hosp Med Sch, Cardiol Clin 1, Athens, Greece
[3] VAMC, Washington, DC USA
[4] Georgetown Univ, Washington, DC USA
[5] George Washington Univ, Washington, DC USA