[1] Univ Calif San Francisco, Div Orthodont, Dept Orofacial Sci, Sch Dent, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Oral & Maxillofacial Surg, Sch Dent, San Francisco, CA 94143 USA
[3] Showa Univ, Dept Orthodont, Tokyo, Japan
[4] Diagnost Digital Imaging, Sacramento, CA USA