| Affiliation: | (1) Department of Orthopedics & Rehabilitation, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 0728 JPP, Iowa City, IA 52242-1088, USA;(2) Boston University Clinical Epidemiology Research Training Unit, Boston University School of Medicine, 715 Albany Street, A203, Boston, MA 02118, USA;(3) Department of Epidemiology, University of Iowa School of Public Health, C-21P-1 GH, Iowa City, IA 52242, USA;(4) Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, 510 20th Street South, FOT 840, Birmingham, AL 35294, USA;(5) Department of Epidemiology & Biostatistics, University of California, San Francisco, Box 0560, 185 Berry Street, Lobby 4, Suite 5700, San Francisco, CA 94107-1762, USA |
