[1] Edith Nourse Rogers Mem Vet Adm Hosp, Connect Tissue Res Lab, Bedford, MA 01730 USA
[2] Tufts Univ, New England Med Ctr, Div Rheumatol, Boston, MA 02111 USA
[3] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Rheumatol Immunol Allergy, Boston, MA 02115 USA