[1] Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany
[2] Duke Clin Res Inst, Durham, NC USA
[3] Duke Univ, Med Ctr, Durham, NC USA
[4] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA
[5] Boehringer Ingelheim Pharmaceut Inc, 90 E Ridge POB 368, Ridgefield, CT 06877 USA
[6] Univ Michigan, Div Pulm & Crit Care Med, Ann Arbor, MI 48109 USA
[7] Univ Virginia, Div Pulm & Crit Care Med, Charlottesville, VA USA