1. Department of Oral Surgery, Universidad de Salamanca, 37007 Salamanca, Spain
2. Department of Health Sciences, Miguel de Cervantes European University of Valladolid, 47012 Valladolid, Spain
3. Department of Dentistry, Universidad Alfonso X el Sabio, 28691 Villanueva de la Cañada, Spain
4. Department of Dentistry, Universidad Católica San Antonio de Murcia, 30107 Murcia, Spain