1 Department of Dermatology, Venereology and Allergology, Universitätsklinikum Schleswig-Holstein, Kiel, Germany.
2 Department of Dermatology, Venereology and Allergology, Erasmus MC University Medical Centre Rotterdam-Sophia's Children Hospital, Rotterdam, The Netherlands.
3 Department of Dermatology and Venereology, Medical University of Vienna, Vienna, Austria.
4 Department of Dermatology and Venereology, Manisa Celal Bayar University, Manisa, Turkey.