Douglas A. Young, DDS, MS, MBA 
Department of Dental Practice, University of the Pacific, Arthur A. Dugoni School of Dentistry, 2155 Webster Street, Room 400, San Francisco, CA 94115, USA
Margherita Fontana, DDS, PhD 
Department of Cariology, Restorative Sciences and Endodontics, University of Michigan School of Dentistry, 1011 North University, Room 2029b, Ann Arbor, MI 48109-1078, USA
Mark S. Wolff, DDS, PhD 
Department of Cariology and Comprehensive Care, New York University College of Dentistry, 345 East 24th Street (MC9480), New York, NY 10010, USA