1. Department of Medical Oncology, School of Medicine, Usak University, Usak 64100, Turkey
2. Department of Medical Oncology, Atatürk City Hospital, Altieylul, Balıkesir 10100, Turkey
3. Department of Medical Oncology, School of Medicine, Uludag University, Nilufer, Bursa 16059, Turkey
4. Department of Medical Oncology, School of Medicine, Inonu University, Battalgazi, Malatya 44280, Turkey
5. Department of Medical Oncology, School of Medicine, Dokuz Eylul University, Konak, İzmir 35210, Turkey
6. Department of Medical Oncology, Bursa Medicana Hospital, Nilufer, Bursa 16110, Turkey
7. Department of Biostatistics, School of Medicine, Uludag University, Nilufer, Bursa 16059, Turkey