[1] Hosp Special Surg, 535 E 70th St, New York, NY 10021 USA
[2] Weill Cornell Med, New York, NY 10021 USA
[3] Oklahoma Med Res Fdn, 825 NE 13th St, Oklahoma City, OK 73104 USA
[4] Amer Univ Beirut, Beirut, Lebanon
[5] Johns Hopkins Med, Baltimore, MD USA
[6] Cleveland Clin Fdn, 9500 Euclid Ave, Cleveland, OH 44195 USA
[7] Mt Sinai Hosp, Toronto Western Hosp, Toronto, ON, Canada
[8] Univ Toronto, Toronto, ON, Canada
[9] Columbia Univ, Irving Med Ctr, New York, NY USA
[10] Oregon Hlth & Sci Univ, Portland, OR 97201 USA
[11] VA North Texas Hlth Care Syst, Dallas, TX USA
[12] Univ Texas Southwestern Med Ctr Dallas, Dallas, TX 75390 USA
[13] Brigham & Womens Hosp, 75 Francis St, Boston, MA 02115 USA
[14] Harvard Med Sch, Boston, MA 02115 USA
[15] Childrens Hosp, London Hlth Sci Ctr, London, ON, Canada
[16] Univ Massachusetts, Chan Med Sch, Worcester, MA USA
[17] Univ Alabama Birmingham, Birmingham, AL USA
[18] Univ Iowa, Carver Coll Med, Iowa City, IA USA
[19] Ohio State Univ, Columbus, OH 43210 USA
[20] Nationwide Childrens Hosp, Columbus, OH USA
[21] Florida State Univ, Coll Med, Tallahassee, FL USA
[22] Baylor Coll Med, Houston, TX 77030 USA
[23] Permanente Med Grp Inc, Union City, CA USA
[24] Brown Univ, Brown Phys Inc, East Providence, RI USA
[25] Providence Vet Affairs Med Ctr, East Providence, RI USA
[26] ECRI Inst, Plymouth Meeting, PA USA
[27] Univ Calif Irvine, Med Ctr, Orange, CA USA
[28] Dalhousie Univ, Halifax, NS, Canada
[29] QEII Hlth Sci Ctr, Halifax, NS, Canada
[30] Boston Childrens Hosp, Boston, MA USA
[31] Georgetown Univ Hosp, Washington, DC 20007 USA
[32] Duke Univ, Durham, NC USA
[33] Univ Washington, Seattle, WA 98195 USA
[34] British Columbia Childrens Hosp, Vancouver, BC, Canada
[35] Amer Coll Rheumatol, 60 Execut Pk S,Suite 150, Atlanta, GA 30329 USA