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The Department of Dermatology, Zealand University Hospital is a part of the European Reference Network for skin diseases.

Funding sources: none.

Conflicts of interest: D.B., M.L.M. and R.K.A. declare they have no conflicts of interest. G.B.E.J. has received honoraria from AbbVie, Chemocentryx, Coloplast, Incyte, InflaRx, Novartis, Pierre Fabre and UCB for participation on advisory boards; has received grants from AbbVie, AstraZeneca, InflaRx, Janssen‐Cilag, LEO Pharma, Novartis, Regeneron, Sanofi and UCB for participation as an investigator; has received speaker honoraria from AbbVie, Boehringer Ingelheim and Galderma; and has received unrestricted departmental grants from AbbVie, LEO Pharma and Novartis. A.A. has received honoraria as a consultant, speaker or advisory board participant from AbbVie, Galderma, Janssen, LEO, Novartis, Sanofi and Valeant; has received grants from AbbVie, Boehringer Ingelheim and Kymera; and has been a research investigator for AbbVie, Aristea, Asana, Boehringer Ingelheim, Bristol Myers Squibb, Dermavant, Eli Lilly, Genentech, Glenmark, Incyte, InflaRx, Janssen, Kymera, Kyowa, LEO, Novartis, Pfizer, Regeneron and UCB.

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