[1] Odense Univ Hosp, Allergy Ctr, DK-5000 Odense, Denmark
[2] Univ Zurich Hosp, Dept Dermatol, Allergy Unit, CH-8091 Zurich, Switzerland
[3] Sahlgrens Univ Hosp, Asthma & Allergy Res Grp, Dept Resp Med & Allergy, Gothenburg, Sweden
[4] Hosp Dr Negrin, Secc Alerg, Las Palmas Gran Canaria, Spain
[5] Allergieambulatorium, Vienna, Austria
[6] Southampton Univ Hosp NHS Trust, Wellcome Trust Clin Res Facil, Southampton, Hants, England
[7] Univ Utrecht, Med Ctr, Dept Dermatol Allergol, Utrecht, Netherlands
[8] Hosp Cent, Nancy, France
[9] Hosp Bro St John God, Dept Allergy & Clin Immunol, Polyclin, Budapest, Hungary
[10] Univ Childrens Hosp Charite, Dept Pediat Pneumol & Immunol, Berlin, Germany
[11] Niguardo Cagranda, Milan, Italy
[12] Tech Univ Munich, Dept Dermatol & Allergol, Munich, Germany
[13] Tech Univ Munich, Div Environm Dermatol & Allergol GSF TUM, Dept Dermatol & Allergy Biederstein, Munich, Germany
[14] Hannover Med Sch, Dept Dermatol & Allergol, Haut Klin Linden, Hannover, Germany