1. Erasmus Hospital, Université Libre de Bruxelles, Department of Oral and Maxillofacial Surgery, Brussels, Belgium
2. Queen Fabiola Children's Hospital, Université Libre de Bruxelles, Department of Plastic Surgery, Brussels, Belgium
3. Erasmus Hospital and Queen Fabiola Children's Hospital, Department of Oral and Maxillofacial Surgery, Université Libre de Bruxelles, Brussels, Belgium