1. Dermatology Service, Miguel Servet University Hospital , Zaragoza , Spain
2. Institute for Health Research Aragón (IIS Aragón) , Zaragoza , Spain
3. Dermatology Service, Complejo Hospitalario Universitario de Ferrol , A Coruña , Spain
4. Universidad de Santiago de Compostela , Santiago de Compostela , Spain
5. Pathological Anatomy Service, Miguel Servet University Hospital , Zaragoza , Spain