Affiliation: | 1. Department of Public Health, Temple University, Philadelphia, Pennsylvania;2. Department of Work Environment, University of Massachusetts Lowell, Lowell, Massachusetts;3. Epidemiologic Unit, Piedmont Region, Grugliasco (TO), Italy;4. Division of Rheumatology, Immunology and Allergy and Department of Orthopaedic Surgery Brigham and Women's Hospital, Boston, Massachusetts |