van Steenberghe Daniel, Quirynen Marc, Molly Liene, Jacobs Reinhilde
Department of Periodontology, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Catholic University Leuven, Belgium.
Periodontol 2000. 2003;33:163-71. doi: 10.1046/j.0906-6713.2003.03313.x.