Giovanni Neri, MD, is a Senior Genetics Scholar at the JC Self Research Institute of Human Genetics, Greenwood Genetic Center; and Professor (retired) of Medical Genetics, Università Cattolica del S. Cuore, Roma. Luigi Boccuto, MD, is a Research Scientist at the JC Self Research Institute of Human Genetics, Greenwood Genetic Center. Roger E. Stevenson, MD, is a Senior Clinical Geneticist at the JC Self Research Institute of Human Genetics, Greenwood Genetic Center.