[1] Univ Sydney, Woolcock Inst Med Res, 431 Glebe Point Rd, Glebe, NSW 2037, Australia
[2] Univ Cape Town, Lung Inst, ZA-7925 Cape Town, South Africa
[3] Univ Manitoba, Winnipeg, MB, Canada
[4] Univ Laval, Quebec Heart & Lung Inst, Quebec City, PQ, Canada
[5] Univ Fed Bahia, Salvador, BA, Brazil
[6] Harvard Univ, Sch Med, Boston, MA USA
[7] Univ Helsinki, Cent Hosp, Helsinki, Finland
[8] Global Initiat Asthma, Vancouver, WA USA
[9] Kagoshima Univ, Kagoshima 890, Japan
[10] Erasmus Univ, Med Ctr, Dept Pediat, Rotterdam, Netherlands
[11] Univ Wisconsin, Madison, WI USA
[12] St Josephs Healthcare, Firestone Inst Resp Hlth, Hamilton, ON, Canada
[13] McMaster Univ, Hamilton, ON, Canada
[14] Univ Pisa, Pisa, Italy
[15] Univ Southern Denmark, Kolding Hosp, Pediat Res Unit, Kolding, Denmark
[16] Univ Fed Santa Catarina, NUPAIVA Asthma Res Ctr, Florianopolis, SC, Brazil
[17] Univ Costa Rica, Natl Childrens Hosp, San Jose, Costa Rica
[18] Childrens Hosp Colorado, Aurora, CO USA
[19] Chinese Univ Hong Kong, Prince Wales Hosp, Dept Pediat, Hong Kong, Hong Kong, Peoples R China
[20] Univ British Columbia, Inst Heart & Lung Hlth, Vancouver, BC V5Z 1M9, Canada