[1] Woolcock Inst Med Res, Camperdown, NSW, Australia
[2] Univ Cape Town, Lung Inst, ZA-7925 Cape Town, South Africa
[3] Hop Laval, Inst Cardiol & Pneumol, Quebec City, PQ, Canada
[4] Univ Calif San Francisco, San Francisco, CA 94143 USA
[5] Creighton Univ, Omaha, NE 68178 USA
[6] Univ Mediterranee, Marseille, France
[7] Univ Arizona, Tucson, AZ USA
[8] Univ Newcastle, Ctr Asthma & Resp Dis, Callaghan, NSW 2308, Australia
[9] Univ Newcastle, Hunter Med Res Inst, Callaghan, NSW 2308, Australia
[10] Sophia Childrens Univ Hosp, Rotterdam, Netherlands
[11] Univ Groningen, Univ Med Ctr Groningen, NL-9713 AV Groningen, Netherlands
[12] Univ Edinburgh, Edinburgh, Midlothian, Scotland
[13] McMaster Univ, Firestone Inst Resp Hlth, Hamilton, ON, Canada
[14] Univ London Imperial Coll Sci Technol & Med, London, England
[15] Univ Leicester, Leicester, Leics, England
[16] Univ Amsterdam, Amsterdam, Netherlands
[17] Univ Nevada, Sch Med, Reno, NV 89557 USA
[18] Natl Jewish Med & Res Ctr, Denver, CO USA
[19] Univ Colorado, Hlth Sci Ctr, Denver, CO USA
[20] Univ Washington, Seattle, WA 98195 USA
[21] Univ Otago, Dunedin Sch Med, Dunedin, New Zealand
[22] Univ Aberdeen, Aberdeen, Scotland
[23] Univ Pittsburgh, Pittsburgh, PA USA