[1] Duke Clin Res Inst, Durham, NC USA
[2] Duke Univ, Med Ctr, Durham, NC USA
[3] UCLA, David Geffen Sch Med, Los Angeles, CA USA
[4] Tulane Univ, Sch Med, New Orleans, LA 70112 USA
[5] Univ Alabama Birmingham, Dept Med, Birmingham, AL USA
[6] Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany
[7] Boehringer Ingelheim Pharmaceut Inc, Ridgefield, CT 06877 USA