Affiliation: | 1. Helsinki University Hospital, Skin and Allergy Hospital, Department of Dermatology, Helsinki, Helsinki, Finland;2. Department of Dermatology and Allergy Centre, Tampere University Hospital, Tampere, Finland;3. Department of Dermatology, Kuopio University Hospital, Kuopio, Finland;4. PEDEGO research Unit and MRC Oulu, Department of Dermatology, Oulu University and Oulu University Hospital, Oulu, Finland |