[1] Karolinska Inst, Karolinska Univ Hosp, Dept Womens & Childrens Hlth, SE-17177 Stockholm, Sweden
[2] Northeastern Univ, Dept Phys Therapy, Bouve Coll Hlth Sci, Boston, MA 02115 USA
[3] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Rheumatol Immunol & Allergy, Boston, MA 02115 USA