[1] London Chest Hosp, Dept Resp Med, London E2 9JX, England
[2] Nihon Univ, Sch Med, Div Resp Med, Tokyo, Japan
[3] Univ Tokyo, Dept Resp Med, Tokyo, Japan
[4] Novartis Pharmaceut, Primary Care, E Hanover, NJ USA
[5] Novartis Horsham Res Ctr, Primary Care, Horsham, W Sussex, England