Georgios K Chalikias1, Dimitrios N Tziakas2. 1. Cardiology Department, Medical School, Democritus University of Thrace, 68100, Dragana, Alexandroupolis, Greece. gchaliki@med.duth.gr. 2. Cardiology Department, Medical School, Democritus University of Thrace, 68100, Dragana, Alexandroupolis, Greece.