[1] Univ Penn, Philadelphia, PA 19104 USA
[2] Univ Calif San Francisco, San Francisco, CA 94143 USA
[3] NIH, Bldg 10, Bethesda, MD 20892 USA
[4] Mayo Clin, Rochester, MN USA
[5] Cleveland Clin, Cleveland, OH 44106 USA
[6] Univ Groningen, Groningen, Netherlands
[7] Univ Michigan, Ann Arbor, MI 48109 USA
[8] Boston Univ, Boston, MA 02215 USA
[9] Johns Hopkins Univ, Baltimore, MD USA
[10] Hosp Special Surg, 535 E 70th St, New York, NY 10021 USA
[11] Duke Univ, Med Ctr, Durham, NC USA
[12] Massachusetts Gen Hosp, Boston, MA 02114 USA