[1] Vanderbilt Univ, Sch Med, Nashville, TN 37212 USA
[2] Univ Alabama Birmingham, Birmingham, AL USA
[3] Duke Clin Res Inst, Durham, NC USA
[4] Duke Univ, Med Ctr, Durham, NC USA
[5] Piedmont Heathcare, Atlanta, GA USA
[6] Cleveland Clin, Cleveland, OH 44106 USA
[7] Baylor Coll Med, Houston, TX 77030 USA
[8] Boehringer Ingelheim Pharmaceut Inc, Ridgefield, CT USA