1. Department of Dermatology; National Institute of Medical Sciences and Nutrition “Dr. Salvador Zubirán”; Mexico City Mexico
2. Department of Dermatology; General Hospital “Dr. Manuel Gea González”; Mexico City Mexico
3. Department of Health Care; Autonomous Metropolitan University; Mexico City Mexico
4. Division of Epidemiological Research; General Hospital “Dr. Manuel Gea González”; Mexico City Mexico
5. Department of Stomatology; Institute of Biomedical Sciences; Autonomous University of Ciudad Juárez; Ciudad Juárez Chihuahua Mexico