1. Department of Periodontics and Dental Hygiene The University of Texas Health Science Center School of Dentistry Houston Texas USA
2. Division of Periodontics, Section of Oral and Diagnostic Sciences Columbia University College of Dental Medicine New York New York USA
3. Biostatistics & Epidemiology Research Design Core, Center for Clinical and Translational Sciences, Department of Internal Medicine, Medical School The University of Texas Health Science Center at Houston Houston Texas USA
4. Private practice Toronto Ontario Canada
5. Department of Pediatric and Special Needs Dentistry Arkansas Children's Hospital Little Rock Arkansas USA
6. Private practice New York, New York USA