1 Department of Dermatology, Concord Hospital, The University of Sydney Medical School, Sydney, Australia. Electronic address: samuel.zagarella@sydney.edu.au.
2 Department of Dermatology, Harvard Medical School, Boston, Massachusetts; Beth Israel Deaconess Medical Center, Boston, Massachusetts.
3 Department of Medicine, University of Tasmania Medical School, Launceston, Tasmania, Australia.
4 Carol Davila University of Medicine and Pharmacy, Bucharest, Romania.