[1] Duke Clin Res Inst, Durham, NC USA
[2] Duke Univ, Med Ctr, Durham, NC USA
[3] Columbia Univ, Inst Genom Med, New York, NY USA
[4] Duke Clin Res Inst, Durham, NC USA
[5] Loyola Univ, Div Pulm & Crit Care, Chicago Stritch Sch Med, Maywood, IL USA
[6] Univ Minnesota, Minneapolis, MN USA
[7] Univ Virginia, Div Pulm & Crit Care Med, Charlottesville, VA USA
[8] Univ Chicago, Sect Pulm, Crit Care Med, Chicago, IL USA
[9] Columbia Univ, Irving Med Ctr, New York, NY USA
[10] Boehringer Ingelheim Pharma GmbH Co KG, Ingelheim, Germany
[11] Boehringer Ingelheim Pharmaceut Inc, Ridgefield, CT USA