1. Department of Endodontics; Shanghai Research Institute of Stomatology; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; 639 Zhizaoju Road Shanghai 200011 China
2. Department of Oral Medicine; Shanghai Stomatological Hospital; 1258 Middle Fuxing Road Shanghai 200031 China
3. Division of Physical Biology & Bioimaging Center; Shanghai Synchrotron Radiation Facility; Shanghai Institute of Applied Physics; Chinese Academy of Sciences; Shanghai 201800 China
4. Chemistry Department; King Saud University; Riyadh 11451 Saudi Arabia
5. UCB Pharma; 208 Bath Road Slough SL1 3WE UK