1. Department of Orthopaedic Surgery, Johns Hopkins Hospital and Medical Institutions, Baltimore, Maryland 21287-0881, Address reprint requests to Dr. Michelson at Department of Orthopaedic Surgery, Johns Hopkins Outpatient Center, 601 N. Caroline St., Baltimore, Maryland 21287-0881.
2. Division of Molecular and Clinical Rheumatology, Department of Medicine, Johns Hopkins Hospital and Medical Institutions.