Affiliation: | 1. Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA;2. Department of Periodontics, Endodontics and Dental Hygiene, Center for Oral Health and Systemic Disease, University of Louisville School of Dentistry, Louisville, KY, USA;3. Health Care Research Center, Procter & Gamble Company, Mason, OH, USA;4. Institute of Medical Microbiology and Hygiene, Philipps University Marburg, Marburg, Germany |