[1] Univ Padua, Dept Pediat, I-35128 Padua, Italy
[2] ESPACI, Lerum, Sweden
[3] Sonderborg Hosp, Dept Pediat, Sonderborg, Denmark
[4] Odense Univ Hosp, Dept Pediat, DK-5000 Odense, Denmark
[5] Humboldt Univ, Univ Childrens Hosp Charite, Dept Pneumol & Immunol, Berlin, Germany
[6] CLB, Dept Allergy, Amsterdam, Netherlands
[7] St Marys Hosp, Clin Allergy Res Unit, Newport, Wight, England
[8] Marien Hosp, Abt Kinderheilkunde, Wesel, Germany
[9] Voksentoppen Natl Ctr Asthma Allergy & Chron Lung, Oslo, Norway
[10] Linkoping Univ Hosp, Dept Paediat, S-58185 Linkoping, Sweden
[11] Univ Geneva, Geneva, Switzerland
[12] Royal Childrens Hosp, Dept Allergy, Melbourne, Vic, Australia
[13] Southampton Gen Hosp, Southampton SO9 4XY, Hants, England
[14] Kaiser Permanente San Diego, San Diego, CA USA
[15] Cty Hosp Ryhov, Dept Paediat, Jonkoping, Sweden
[16] Univ Hosp Sophia Rotterdam, Dept Dermatol & Venerol, Rotterdam, Netherlands
[17] Hosp Infantil Hosp La Paz, Serv Alergia, Madrid, Spain
[18] Univ Western Australia, Dept Paediat, Subiaco, WA, Australia
[19] Mt Sinai Sch Med, Dept Pediat, Div Allergy & Immunol, New York, NY USA
[20] Karolinska Hosp, Dept Publ Hlth Sci, Div Occupat Med, S-10401 Stockholm, Sweden
[21] Free Univ Brussels, AZ Kinderen, Brussels, Belgium
[22] Karolinska Hosp, Dept Environm Hlth, Stockholm, Sweden