Skin and Allergy Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland. Electronic address: tari.haahtela@haahtela.fi. Department of Lung Diseases and Clinical Allergology, University of Turku, Turku, Finland; Allergy Clinic, Suomen Terveystalo Oy, Turku, Finland. Allergy, Skin, and Asthma Federation, Helsinki, Finland. Finnish Institute of Occupational Health, Helsinki, Finland. Skin and Allergy Hospital, Helsinki University Hospital, University of Helsinki, Helsinki, Finland. Finnish Institute for Health and Welfare, Helsinki, Finland. Finnish Lung Health Association, Helsinki, Finland. Charité, Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Comprehensive Allergy Center, Department of Dermatology and Allergy, Berlin, Germany; University Hospital, Montpellier, France; MACVIA France, Montpellier, France.