1. Departments of Cranio-Maxillofacial Surgery, Hospital Lucerne, Lucerne (Dr Lieger), and Inselspital/Bern University Hospital and University of Bern, Bern (Drs Zix and Iizuka), Department of Oral and Maxillofacial Surgery, University Hospital and University of Zurich, Zurich (Dr Kruse), and Department of Ophthalmology, University Hospital and University of Basel, Basel (Dr Goldblum), Switzerland.