1. Department of Cardiovascular Surgery, Ordu State Hospital, Ordu, Turkey
2. Department of Cardiovascular Surgery, School of Medicine, Pamukkale University, Denizli, Turkey
3. Department of Biostatistics, Faculty of Medicine, Uludag University, Bursa, Turkey
4. Department of Cardiovascular Surgery, School of medicine, Katip Celebi University, İzmir, Turkey