1. Service of Oral and Maxillofacial Surgery, Hospital HM Nens, HM Hospitales, 08009 Barcelona, Spain
2. Instituto de Investigación Sanitaria HM Hospitales, Madrid, Spain
3. Pediatric Dentistry Department, Faculty of Dentistry, Universitat Internacional de Catalunya (UIC), 08195 Barcelona, Spain
4. Oral and Maxillofacial Surgery Service Institut Ferrés Amat, 08021 Barcelona, Spain
5. Service of Pediatric Dentistry, Hospital HM Nens, HM Hospitales, 08009 Barcelona, Spain
6. Oral and Maxillofacial Medicine and Oral Public Health Department, Faculty of Dentistry, Universitat Internacional de Catalunya (UIC), 08195 Barcelona, Spain
7. Oral and Maxillofacial Department, Faculty of Dentistry, Universitat Internacional de Catalunya (UIC), 08195 Barcelona, Spain