1 Biofilm Research Laboratory, Department of Orthodontics, Divisions of Pediatric Dentistry and Community Oral Health, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
2 Department of Medicine, Section of Infectious Diseases, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.
3 Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.
4 Department of Pediatrics, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America.
5 Department of Microbiology and Immunology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, United States of America.