1 University of Health Sciences, Faculty of Medicine Bakırköy Dr. Sadi Konuk Education and Training Hospital , Department of Rheumatology, Istanbul, Turkey.
2 Eskisehir Osmangazi University, Faculty of Medicine, Department of Biostatistics, Eskisehir, Turkey.
3 Marmara University Faculty of Medicine Department of Internal Medicine, Division of Rheumatology. Istanbul, Turkey.
4 Altinbas University Faculty of Medicine, Department of Internal Medicine, Division of Rheumatology, Bahcelievler Medicalpark Hospital, Istanbul, Turkey. mhmtsoy@gmail.com.