1. Division of Developmental Pediatrics, Department of Pediatrics, Saint Louis University, St. Louis, MO 63014, USA
2. Division of Developmental Medicine, Department of Pediatrics, University of Washington, Seattle, WA 98195-5852, USA
3. Department of Sociology and Criminal Justice, Saint Louis University, St. Louis, MO 63108, USA
4. School of Education, Texas Christian University, Forth Worth, TX 76129-0002, USA
5. National Foundation for Ectodermal Dysplasias, Mascoutah, IL 62258, USA
6. Department of Pediatrics, Saint Louis University, St. Louis, MO 63108, USA
7. Department of Community Health, Saint Louis University, St. Louis, MO 63108, USA
8. Department of Child Health, University of Missouri, Columbia, MO 65212, USA