1. Department of Cardivascular Surgery, University of Health Sciences Trabzon Ahi Evren Thoracic and Cardiovascular Surgery Training and Research Hospital, Trabzon, Turkey
2. Department of Training Unit, University of Health Sciences Trabzon Ahi Evren Thoracic and Cardiovascular Surgery Training and Research Hospital, Trabzon, Turkey
3. Department of Cardivascular Surgery, Recep Tayyip Erdogan University Training and Research Hospital, Rize, Turkey
4. Department of Cardivascular Surgery, Samsun Training and Research Hospital, Samsun, Turkey
5. Department of Cardivascular Surgery, Karadeniz Technical University Application and Research Center (Farabi Hospital), Trabzon, Turkey.