1. School of Pharmacy and Shanxi Provincial Key Laboratory of Drug Synthesis and Novel Pharmaceutical Preparation Technology, Shanxi Medical University, Taiyuan 030001, P.R. China
2. Department of Pharmacy, College of Biology, Hunan University, Changsha, Hunan 410082, P.R. China
3. Division of Advanced Prosthodontics, University of California at Los Angeles, Los Angeles, California 90095, United States