1. Department of Skin and Allergic Diseases; Helsinki University Central Hospital; Helsinki Finland
2. «Tattoo» Consultation; Department of Dermatology; Bichat-Claude Bernard Hospital; Assistance Publique-Hôpitaux de Paris; Paris France
3. Dermatology; Private Practice; Montbonnot-Saint-Martin France
4. Dermatology; Private Practice; Grenoble France