Authors
Xiaoming Xu
Department of Comprehensive Dentistry and Biomaterials, Louisiana State University Health Sciences Center, New Orleans, United States of America
Joseph L. Hagan
School of Public Health, Louisiana State University Health Sciences Center, New Orleans, United States of America
Paul C. Armbruster
the Department of Orthodontics, Louisiana State University Health Sciences Center, New Orleans, United States of America
Richard W. Ballard
the Department of Orthodontics, Louisiana State University Health Sciences Center, New Orleans, United States of America