Programmed death ligand 1 negatively regulates inflammatory response of chronic periodontitis
Yuan Wenwen, Wang Xiaoqian, Zhang Jiehua, Zhou Wenjie, Feng Yun, Chen Jiao, Zhang Ping
West China Journal of Stomatology . 2015, (4): 366 -369 .  DOI: 10.7518/hxkq.2015.04.009