1. Department of Nephrology, Gaziosmanpasa University, Faculty of Medicine, Tokat, Turkey
2. Central Laboratory, Cukurova University, Faculty of Medicine, Balcali Hospital, Adana, Turkey
3. Department of Rheumatology/Immunology, Cukurova University, Faculty of Medicine, Adana, Turkey
4. Department of Internal Medicine, Gaziosmanpasa University, Faculty of Medicine, Tokat, Turkey