Harrel Stephen K, Nunn Martha E, Hallmon William W
Department of Periodontology, Baylor College of Dentistry, Texas A&M University Health Science Center, Dallas, TX 75229, USA.
J Am Dent Assoc. 2006 Oct;137(10):1380, 1382, 1384 passim. doi: 10.14219/jada.archive.2006.0049.