1 Case Western Reserve University School of Dentistry, Cleveland, Ohio.
2 Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.
3 University of Texas Health San Antonio School of Dentistry, San Antonio, Texas.
4 University of Alabama, Tuscaloosa, Alabama.
5 Texas A&M College of Dentistry, Dallas, Texas.
6 University of Texas Health Science Center at Houston School of Dentistry, Houston, Texas.
7 Private Practice, Durham, North Carolina.
8 Private Practice, Scottsdale, Arizona.
9 Diplomate, American Board of Endodontics; Assistant Professor, Clinic & Predoctoral Program and Director, Department of Endodontics, University of Pennsylvania, Philadelphia, Pennsylvania.
10 The Dental College of Georgia, Augusta University, Augusta, Georgia.
11 University of Texas Health San Antonio School of Dentistry, San Antonio, Texas. Electronic address: Hargreaves@uthscsa.edu.