[1] Univ KwaZulu Natal, Nelson R Mandela Sch Med, Dept Pulmonol & Crit Care, ZA-4013 Durban, South Africa
[2] GlaxoSmithKline, Uxbridge, Middx, England
[3] Showa Univ, Dept Internal Med 1, Tokyo, Japan
[4] Philippine Heart Ctr, Quezon City, Philippines
[5] St Petersburg Med Acad Postgrad Studies, Dept Resp Med & Allergy, St Petersburg, Russia
[6] Pontificia Univ Catolica Rio Grande do Sul, Porto Alegre, RS, Brazil
[7] Shanghai 1 Peoples Hosp, Dept Pediat, Shanghai, Peoples R China
[8] Hosp Angeles Ctr Med Potosi, San Luis Potosi, Mexico
[9] Woolcock Inst Med Res, Sydney, NSW, Australia
[10] Chinese Japanese Friendship Hosp, Beijing, Peoples R China
[11] Hosp Infantil Californias, Tijuana Baja California, Mexico
[12] O Alassia Childrens Hosp, Resp Med Unit, Santa Fe, Argentina
[13] Hacettepe Univ, Paediat Allergy & Asthma Unit, Ankara, Turkey
[14] Celal Bayar Univ, Dept Chest Dis, Manisa, Turkey
[15] Univ Cape Town, Red Cross War Mem Childrens Hosp, Dept Paediat & Child Hlth, ZA-7925 Cape Town, South Africa