[1] Univ Cape Town, Dept Med, ZA-7700 Cape Town, South Africa
[2] Pulm Res Inst Southeast Michigan, Livonia, MI USA
[3] Novartis Pharmaceut, E Hanover, NJ USA
[4] Barts Hlth NHS Trust, London Chest Hosp, London, England
[5] Novartis Horsham Res Ctr, Horsham, W Sussex, England