1 Division of Endodontics, Department of Advanced Oral Sciences and Therapeutics, School of Dentistry, University of Maryland Baltimore, Baltimore, Maryland; Private practice, Centreville Endodontics, Centreville, Virginia.
2 Division of Endodontics, Department of Advanced Oral Sciences and Therapeutics, School of Dentistry, University of Maryland Baltimore, Baltimore, Maryland; Private practice, Centreville Endodontics, Centreville, Virginia; Private practice, Capitol Endodontics, Washington, DC.
3 Department of Endodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Department of Oncology and Diagnostic Sciences, School of Dentistry, University of Maryland Baltimore, Baltimore, Maryland.
5 Department of Endodontics, School of Dental Medicine, Case Western Reserve University, Cleveland, Ohio.
6 Department of Oral Rehabilitation, James B. Edwards College of Dental Medicine, Medical University of South Carolina, Charleston, South Carolina.