1. Faculty of Medicine, Department of Internal Medicine, Hacettepe University, Ankara, Turkey
2. Faculty of Medicine, Department of Rheumatology, Hacettepe University, Ankara, Turkey
3. Department of Rheumatology, Saglik Bilimleri Universitesi, Van Egitim ve Arastirma Hastanesi, Van, Turkey
4. Faculty of Medicine, Department of Neurology, Hacettepe University, Ankara, Turkey