Charles A. Williams,1,2* Arthur L. Beaudet,2,3 Jill Clayton-Smith,4 Joan H. Knoll,5 Martin Kyllerman,6 Laura A. Laan,7 R. Ellen Magenis,8 Ann Moncla,9 Albert A. Schinzel,10 Jane A. Summers,11 and Joseph Wagstaff 2,12

1 Department of Pediatrics, Division of Genetics, R.C. Philips Unit, University of Florida, Gainesville, Florida // 2 Scientific Advisory Committee, Angelman Syndrome Foundation, Aurora, Illinois // 3 Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas // 4 Academic Department of Medical Genetics, St. Mary’s Hospital, Manchester, United Kingdom // 5 Section of Medical Genetics and Molecular Medicine, Children’s Mercy Hospital and Clinics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri // 6 Department of Neuropediatrics, The Queen Silvia Children’s Hospital, University of Goteborg, Goteborg, Sweden // 7 Department of Neurology, Leiden University Medical Center, RC Leiden, The Netherlands // 8 Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, Oregon // 9 De´partement de Ge´ne´tique Me´dicale, Hoˆpital des enfants de la Timone, Marseille, France // 10 Institute of Medical Genetics, University of Zurich, Zurich, Switzerland // 11 McMaster Children’s Hospital, Hamilton Health Sciences, Hamilton, Ontario, Canada // 12 Department of Pediatrics, Clinical Genetics Program, Carolinas Medical Center, Charlotte, North Carolina



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