1. Unit of Medical Genetics; Department of Pediatrics; Faculty of Medicine; University of The Andes; Mérida Venezuela
2. Department of Dermatology; School of Medicine; Hokkaido University; Sapporo Japan
3. Bambino Gesù Children's Hospital IRCCS; Research Laboratory; Rome Italy
4. Department of Dentistry; Bambino Gesù Children's Hospital - IRCCS; Viale S. Paolo 15 00147 Rome Italy