Affiliation: | a Ataturk Teaching and Research Hospital, Izmir, Turkey b Inonu University, Malatya, Turkey c Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA, USA d Istanbul University, Istanbul Medical Faculty, Istanbul, Turkey e Istanbul University, Cerrahpasa Medical Faculty, Istanbul, Turkey f Uludag University, Bursa, Turkey g Marmara University School of Medicine, Istanbul, Turkey h Oncology State Hospital and Mamer Surgical Clinic, Bursa, Turkey i Adnan Menderes University Medical Faculty, Aydin, Turkey j Ankara University, Ankara, Turkey k Cumhuriyet University, Sivas, Turkey l Magee-Womens Hospital of UPMC, 300 Halket St., Suite 2601, Pittsburgh PA, USA |