1. Department of Oral and Maxillofacial Surgery, Hospital Central de la Policia, Bogotá, Colombia
2. Department of Oral and Maxillofacial Surgery, Hospital El Tunal, Bogotá, Colombia
3. Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center at San Antonio, San Antonio, Texas
4. Universidad Nacional, Bogotá, Colombia
5. Fundaciön Universitaria San Martín, Bogotá, Colombia