1. Biofilm Research Labs, Levy Center for Oral Health Research, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
2. Department of Orthodontics & Divisions of Pediatric Dentistry & Community Oral Health, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
3. Center for Oral Biology, University of Rochester Medical Center, Rochester, NY 14642, USA