1. Nihon University School of Dentistry, Tokyo, Japan.
2. Creighton University School of Dentistry, Omaha, NE, USA.
3. A.T. Still University Arizona School of Dentistry & Oral Health, Mesa, AZ, USA.
4. Autonomous University of Queretaro School of Dentistry, Queretaro, Mexico.
5. University of Minnesota School of Dentistry, Minneapolis, MN, USA.