[1] Univ Alabama Birmingham, Div Pulm Allergy & Crit Care Med, THT 422,1720,2nd Ave South, Birmingham, AL 35294 USA
[2] Univ Alabama Birmingham, Lung Hlth Ctr, Birmingham, AL USA
[3] GlaxoSmithKline, Stockley Pk, England
[4] Univ Michigan, Div Cardiovasc Med, Ann Arbor, MI 48109 USA
[5] Univ Liverpool, Sch Ageing & Chron Dis, Liverpool, Merseyside, England
[6] Brigham & Womens Hosp, Div Pulm & Crit Care Med, 75 Francis St, Boston, MA 02115 USA
[7] Veramed, Twickenham, England
[8] GlaxoSmithKline, Res Triangle Pk, NC USA
[9] Cornell Univ, Weill Cornell Med Coll, Div Pulm & Crit Care Med, New York, NY 10021 USA
[10] Univ Edinburgh, Div Cardiol, Edinburgh, Midlothian, Scotland
[11] Univ Manchester, Div Infect Immun & Resp Med, Manchester, Lancs, England
[12] Birmingham VA Med Ctr, Div Pulm & Crit Care Med, Birmingham, AL USA