1. Department of Dermatology Hospital del Mar‐Parc de Salut Mar Barcelona Spain
2. Department of Dermatology Kurume University School of Medicine Kurume Japan
3. Department of Dermatology Osaka City University Graduate School of Medicine Osaka Japan
4. Department of Dermatology Hospital Clinic de Barcelona University of Barcelona Barcelona Spain
5. Molecular Cytogenetics Laboratory Department of Pathology Hospital del Mar‐Parc de Salut Mar Barcelona Spain
6. Department of Hematology Hospital del Mar‐Parc de Salut Mar Barcelona Spain