1 Faculty of Medicine, University of Iceland, Reykjavik, Iceland; Department of Dermatology, University of Connecticut, Farmington, Connecticut. Electronic address: adalsteinsson@uchc.edu.
2 Department of Dermatology, University of Connecticut, Farmington, Connecticut.
3 Department of Dermatology, New York University Langone Health, New York, New York.
4 Faculty of Medicine, University of Iceland, Reykjavik, Iceland; Icelandic Cancer Registry, Reykjavik, Iceland.
5 Faculty of Medicine, University of Iceland, Reykjavik, Iceland; Department of Pathology, Landspitali National-University Hospital, Reykjavik, Iceland.