1. Faculty of Continuing Education; Rīga Stradiņš University; Riga Latvia
2. Department of Infectology and Dermatology; Rīga Stradiņš University; Riga Latvia
3. Institute of Anatomy and Anthropology; Rīga Stradiņš University; Riga Latvia
4. Department of Dermatology; University Hospital Zurich; University of Zurich; Zurich Switzerland