[1] Harvard Med Sch, BIDMC, Boston, MA 02115 USA
[2] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[3] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[4] Beth Israel Deaconess, Boston, MA USA
[5] Harvard Univ, Countway Lib, Boston, MA 02115 USA
[6] Hebrew Rehab Ifar, Roslindale, MA USA
[7] Johns Hopkins Med Inst, Baltimore, MD 21205 USA
[8] Imperial Coll, London, England
[9] Univ Oxford, Radcliffe Dept Med, Oxford, England
[10] Univ Texas Sch Pub Hlth, Sugar Land, TX USA
[11] Univ Minnesota, Minneapolis, MN USA
[12] Imperial Coll, London, England
[13] Univ Leuven, Leuven, Belgium
[14] Baylor Coll Med, Houston, TX 77030 USA
[15] Case Western Reserve Univ, Cleveland, OH 44106 USA
[16] Beth Israel Deaconess Med Ctr, Brookline, MA USA