1. The State Key Laboratory Breeding Base of Basic Science of Stomatology and Key Laboratory of Oral Biomedicine Ministry of Education School and Hospital of Stomatology Wuhan University Wuhan China
2. Dongfeng Stomatological Hospital Hubei University of Medicine Shiyan China
3. Division of Endodontics Department of Oral Biological and Medical Sciences Faculty of Dentistry The University of British Columbia Vancouver British Columbia Canada