1. Department of Internal Medicine, Istanbul University-Cerrahpaşa, Istanbul, Turkey
2. Division of Nephrology, Department of Internal Medicine, Van Yuzuncu Yil University, Van, Turkey
3. Division of Rheumatology, Department of Internal Medicine, İstanbul University, Istanbul, Turkey
4. Department of Pathology, Health Science University, Van Training and Research Hospital, Van, Turkey
5. Department of Internal Medicine, Van Yuzuncu Yil University, Van, Turkey