[1] Karolinska Hosp, Dept Med, Allergy & Clin Immunol Unit, SE-17176 Stockholm, Sweden
[2] Univ Southampton, Allergy & Inflammat Sci Div, Southampton, Hants, England
[3] Hop Arnaud Villeneuve, Serv Malad Resp, Montpellier, France
[4] State Univ Utrecht Hosp, Dept Dermatol, NL-3511 GV Utrecht, Netherlands
[5] Voksentoppen, Oslo, Norway
[6] Univ Helsinki, Cent Hosp, Div Allergy Skin & Allergy Hosp, Helsinki, Finland
[7] Fac Med, Dept Allergy & Clin Immunol, Lodz, Poland
[8] Aarhus Univ Hosp, Dept Resp Dis, DK-8000 Aarhus, Denmark
[9] Tech Univ Munich, Klin & Poliklin Dermatol Allergol, D-8000 Munich, Germany
[10] Ghent Univ Hosp, Dept Otorhinolaryngol, B-9000 Ghent, Belgium
[11] Univ Zurich Hosp, Dept Dermatol, Allergy Unit, CH-8091 Zurich, Switzerland