1. Immunology, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, C42 E 10, Iowa City, IA 52241, USA
2. Mercy Iowa City, 540 E Jefferson Street, Suite 205, Iowa City, IA 52245, USA
3. Section of Rheumatology, Temple University Hospital, 3200 North Broad Street, Philadelphia, PA 19140, USA