Kathleen G Neiva1. 1. Assistant Professor, Department of Endodontics, University of Florida, College of Dentistry, 1395 Center Drive, Rm D10-41, P.O. Box 100436, Gainesville, FL 32610-0436, USA, Tel.: +1 352 273 5435; fax: +1 352 273 5446. Electronic address: kneiva@dental.ufl.edu.