1. Oral Medicine, Oral Surgery and Implantology Unit, Faculty of Medicine and Dentistry, Instituto de Investigación Sanitaria de Santiago (IDIS), Santiago de Compostela, Spain;
2. Anatomy and Human Embryology, Functional Biology and Health Science Department, Vigo University, Vigo, Spain;
3. Faculty of Medicine and Dentistry, Stomatology Department, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, Bilbao, Spain