1. Department of Endodontics; West Virginia University School of Dentistry; Morgantown WV USA
2. Department of Bioengineering; University of Texas; Arlington TX USA
3. Department of Clinical Sciences; University of Texas Southwestern Medical Center; Dallas TX USA
4. Division of Endodontology; University of Connecticut Health Center; Farmington CT USA
5. Department of Biomedical Sciences; Texas A&M Health Science Center; Baylor College of Dentistry; Dallas TX USA