[1] Med Hsch, Resp Med, Hannover, Germany
[2] Columbia Univ, Resp Med, New York, NY USA
[3] Azienda Osped Univ Bologna, Resp Med, Bologna, Italy
[4] Johns Hopkins Univ, Resp Med, Baltimore, MD USA
[5] Addenbrookes Hosp, Resp Med, Cambridge, England
[6] Papworth Hosp, Resp Med, Cambridge, England
[7] Golden Jubilee Natl Hosp, Resp Med, Glasgow, Lanark, Scotland
[8] Univ Paris Sud XI, Resp Med, Orsay, France
[9] Duke Univ, Med Ctr, Resp Med, Durham, NC USA
[10] UT Southwestern Med Ctr, Resp Med, Dallas, TX USA
[11] Novartis Horsham Res Ctr, Resp Med, Horsham, W Sussex, England
[12] Novartis Pharmaceut, Resp Med, Cambridge, MA USA
[13] Univ Hosp Giessen & Marburg GmbH, Resp Med, Giessen, Germany