1. Ataturk Chest Disease and Chest Surgery Training and Research Hospital, Department of Medical Oncology, Ankara, Turkey.
2. Hacettepe University Cancer Institute, Department of Medical Oncology, Ankara, Turkey.
3. Ankara Ataturk Training and Research Hospital, Department of Medical Oncology, Ankara, Turkey.
4. Dr. Abdurrahman Yurtaslan Ankara Oncology Training and Research Hospital, Department of Medical Oncology, Ankara, Turkey.