[1] Vanderbilt Univ, Med Ctr, Dept Internal Med, Nashville, TN USA
[2] Univ New Mexico, Dept Pediat, Occupat Therapy Grad Program, Albuquerque, NM USA
[3] Univ Utah, Dept Internal Med, Div Epidemiol, Salt Lake City, UT USA
[4] AOU Careggi, Div Rheumatol, Florence, Italy
[5] AOU Careggi, Scleroderma Unit, Florence, Italy
[6] Univ Florence, Dept Expt & Clin Med, Florence, Italy
[7] 1161 Med Ctr North,T-3113b, Nashville, TN 37323 USA