1 Department of Dermatology, Zealand University Hospital, Roskilde, Denmark; Danish Anaesthesia Allergy Centre, Allergy Clinic, Copenhagen University Hospital Herlev-Gentofte, Gentofte, Denmark. Electronic address: morten.schjoerring.opstrup@regionh.dk.
2 Danish Anaesthesia Allergy Centre, Allergy Clinic, Copenhagen University Hospital Herlev-Gentofte, Gentofte, Denmark.