1. Division of Plastic Surgery, Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
2. Consultation des Angiomes, Hôpital Lariboisiere, Paris, France
3. Division of Plastic Surgery, Cliniques Universitaires St Luc, Université catholique de Louvain, Brussels, Belgium
4. Department of Pathology, Hôpital d'Enfants Trousseau, Paris, France
5. Department of Radiology, Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA
6. Department of Pathology, Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA