1 Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, Germany.
2 Department of Dermatology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
3 Department of Dermatology, Unidade Local de Saúde de Santo António, Porto, Portugal.
4 Department of Dermatology, Hospital General Universitario Gregorio Marañón, Madrid, Spain, Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.