1. College of Medicine, Medical University of South Carolina, Charleston, SC, USA
2. Biochemical Laboratory, Greenwood Genetic Center, Greenwood, SC, USA
3. Department of Pediatrics, Hospital Escuela Materno-Infantil, Tegucigalpa, Honduras
4. Cytogenetics Laboratory, Greenwood Genetic Center, Greenwood, SC, USA
5. Departments of Neurosciences (Neurology) and Pediatrics, Medical University of South Carolina, Charleston, SC, USA
6. J. C. Self Research Institute of Human Genetics, Greenwood Genetic Center, Greenwood, SC, USA