1. Dermatology Clinic: Prof. J. Kisis & Asst. Prof. Rone‐Kupfere Riga Latvia
2. Dr. Maurins Laser Medical Clinic Riga Latvia
3. Department of Medical Oncology, School of Medicine, Faculty of Health Sciences Aristotle University Thessaloniki Greece
4. Second Department of Dermatology, School of Medicine, Faculty of Health Sciences Aristotle University Thessaloniki Greece
5. First Department of Dermatology, School of Medicine, Faculty of Health Sciences Aristotle University Thessaloniki Greece
6. Department of Histopathology Ippokrateio General Hospital Thessaloniki Greece