[1] SUNY Buffalo, Dept Orthodont, Sch Dent Med, Buffalo, NY USA
[2] Meharry Med Coll, Sch Dent, Dept Endodont, Nashville, TN USA
[3] Univ Detroit, Grad Endodont Program, Mercy Sch Dent, Detroit, MI USA
[4] Meharry Med Coll, Maxillofacial Surg Hosp Dent, Sch Dent, Dept Oral, Nashville, TN USA
[5] Univ Minnesota, Dept Restorat Sci, Minneapolis, MN USA
[6] Ohio State Univ, Div Oral & Maxillofacial Surg, Coll Dent, Columbus, OH USA
[7] Rutgers Sch Dent Med, Dept Endodont, Newark, NJ USA
[8] Newark Beth Israel Med Ctr, Dept Dent, Newark, NJ USA
[9] 140 Squire Hall,3435 Main St, Buffalo, NY 14214 USA