1. Department of Internal Medicine; School of Medicine; Marmara University; Istanbul Turkey
2. Department of Rheumatology; Fatih Sultan Mehmet Education and Research Hospital; Istanbul Turkey
3. Department of Rheumatology; School of Medicine; Marmara University; Istanbul Turkey
4. Faculty of Health Sciences; Marmara University; Istanbul Turkey
5. Department of Epidemiology; Mayo Clinic; Rochester Minnesota USA