1. College of Dental Medicine, Roseman University of Health Sciences, South Jordan, UT 84095, USA
2. Department of Orthopaedics, University of Utah, Salt Lake City, UT 84108, USA
3. Department of Educational Psychology, University of Utah, Salt Lake City, UT 84109, USA
4. School of Dentistry, University of the Pacific, San Francisco, CA 94103, USA