[1] Weill Cornell Med, Joan & Sanford I Weill Dept Med, New York, NY USA
[2] China Japan Friendship Hosp, Natl Clin Res Ctr Resp Dis, Beijing, Peoples R China
[3] Univ Hosp Basel, Clin Resp Med & Pulm Cell Res, Basel, Switzerland
[4] Univ Freiburg, Med Ctr, Clin Resp Med, Freiburg, Germany
[5] Univ Freiburg, Fac Med, Freiburg, Germany
[6] AstraZeneca, Cambridge, England
[7] AstraZeneca, Gaithersburg, MD USA