1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Universidad Nacional Autónoma de México, Ciudad Universitaria, México
2. Department of Prosthodontics and Implantology, Faculty of Dentistry, Universidad de Cuenca, Cuenca, Ecuador
3. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Universidad de Cuenca, Cuenca, Ecuador