1. Sanford School of Medicine, University of South Dakota, Sioux Falls, SD, USA
2. Department of Internal Medicine, Coney Island Hospital, Brooklyn, NY, USA
3. National Institute of Arthritis, and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD, USA
4. School of Medicine, Eisenhower Medical Center, University of California, Rancho Mirage, CA, USA