[1] Kings Coll London, Guys Severe Asthma Ctr, Guys & St Thomas NHS Trust, London, England
[2] Kings Coll London, Sch Immunol & Microbial Sci, Asthma UK Ctr, London, England
[3] GSK, Biostat, Stevenage, Herts, England
[4] GSK, Resp Therapeut Area, Res Triangle Pk, NC USA
[5] Mainz Univ Hosp, Pulm Dept, Mainz, Germany
[6] Univ Pittsburgh, Asthma Inst, Pittsburgh, PA USA