1 Department of Pediatric Neurosurgery, Hôpital Femme Mère Enfant, INSERM 1033, Université de Lyon, Centre de Reference Malformations Craniofaciales, Lyon, France.
2 Department of Neurosurgery, Boston Children's Hospital/Harvard Medical School, 300 Longwood Ave, Boston, MA, 02459, USA. Mark.Proctor@childrens.harvard.edu.