1. Department of Internal Medicine, Allegheny General Hospital, 320 E. North Avenue, Pittsburgh, PA 15212, USA
2. Department of Rheumatology, Allegheny General Hospital, 320 E. North Avenue, Pittsburgh, PA 15212, USA
3. Department of Rheumatology, Lakeside Community Healthcare Medical Group, 1500 S. Central Avenue No. 200, Glendale, CA 91204, USA
4. Department of Internal Medicine, Capital Health Regional Medical Center, 750 Brunswick Avenue, Trenton, NJ 08638, USA