1. Facultad de Medicina, Universidad Autónoma del Estado de México , Toluca , Mexico
2. Dermatology Service, Hospital General de Mexico , Mexico City , Mexico
3. The American British Cowdray (ABC) Medical Center , Mexico City , Mexico
4. Research Unit, Institute of Ophthalmology ‘Conde de Valenciana’ , Mexico City , Mexico
5. Department of Biochemistry, Faculty of Medicine, UNAM , Mexico City , Mexico
6. Genetics Service, Hospital General de México , Mexico City , Mexico
7. Escuela Superior de Medicina, Instituto Politécnico Nacional , Mexico City , Mexico