1. Private practice; Warren; New Jersey
2. Memorial Sloan Kettering Cancer Center; Hauppauge; New York
3. Department of Dermatology; Central Clinical Hospital; Ministry of Internal Affairs and Faculty of Health Sciences; Warsaw; Poland
4. Divison of Dermatology; Medical University of Graz; Graz; Austria
5. Department of Dermatology; Melanoma Unit; Hospital Clinic i Provincial de Barcelona; August Pi i Sunyer Biomedical Research Institute; Barcelona; Spain
6. Department of Dermatology; UniversitatsSpital Zurich; Zurich; Switzerland