1. Department of Medical Oncology, Faculty of Medicine; Dokuz Eylul University; Izmir Turkey
2. Department of Internal Medicine, Faculty of Medicine; Dokuz Eylul University; Izmir Turkey
3. Geriatric Center; Kayseri Education and Research Hospital; Kayseri Turkey
4. Department of Medical Oncology; Izmir Tepecik Education and Research Hospital; Izmir Turkey
5. Department of Medical Oncology; Trabzon Kanuni Education and Research Hospital; Trabzon Turkey
6. Department of Biostatistics, Faculty of Medicine; Dokuz Eylul University; Izmir Turkey