[1] Department of Endodontics, University of Texas Health Science at San Antonio, 7703 Floyd Curl Drive, San Antonio, 78229, TX
[2] Department of Endodontics, University of Washington School of Dentistry, 1959 NE Pacific St., D322 Box: 356365, Seattle, 98119-6365, WA
[3] Department of Endodontics, New York University, 421 First Avenue, Suite 7W, New York, 10010, NY