1. Department of Stomatology, PLA Army General Hospital, Beijing, P.R. China
2. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Operative Dentistry and Endodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, P.R. China
3. RCMI Cancer Research Center and Department of Chemistry, Xavier University of Louisiana, New Orleans, LA, USA