Gülen, Oktay Guler, Ahmet Güler, Ahmet Güler, Ekrem, Medipol University, Faculty of Medicine, İstanbul,Turkey Güler, Gamze Babur, Istinye State Hospital, Istanbul, Turkey Gülker, Jan-Erik Gumiężna, Karolina Gummert, Jan F. Gumprecht, Janusz Gumus, Seyfettin Gumułka, Witold Günaldi, Meral, 2nd Clinic for Internal Diseases, Okmeydani Education and Research Hospital, Istanbul, Turkey Gunarathne, Ashan Gunaydin, Zeki Yuksel, Department of Cardiology, Ordu University, School of Medicine, Ordu, TURKEY Gunduz, Huseyin Gunduz, Huseyin, Sakarya Educational and Research Hospital, Department of Cardiology, Sakarya, Turkey Gunduz, Yasemin, Department of Radiology, Sakarya University School of Medicine, Sakarya Gunebakmaz, Ozgur Güneş, Hacı Murat, Kartal Kosuyolu Training and Research Hospital, Cardiology Clinic, Istanbul, Turkey Güngör, Barış, Atrial fibrillation, Electromechanical Delay, Interatrial conduction time. Güngör, Barış, Siyami Ersek Cardiovascular and Thoracic Surgery Center, 34087, Istanbul, Turkey Gungor, Baris, Department of Cardiology, Training and Research Hospital, Siyami Ersek Thoracic and Cardiovascular Surgery Center, Istanbul, Turkey Gungor, Mutlu, Memorial Sisli Hospital, Istanbul Gunsburg, Moshe Y. Gunten, Simon von