In vitro analysis of activities of antimicrobial agents against clinical common organisms causing bloodstream infections, hospital-acquired pneumonia and intra-abdominal infections from twelve teaching hospitals in China: results from the Chinese antimicrobial resistance surveillance of nosocomial infections (CARES) program Henan Li 1 , Chunjiang Zhao 1 , Qi Wang 1 , Ji Zeng 2 # , Yan Jin 3 # , Zhidong Hu 4 # , Kang Liao 5 # , Yanping Luo 6 # , Chao Zhuo 7 # , Rong Zhang 8 # , Xiuli Xu 9 # , Wenen Liu 10 # , Yingmei Liu 11 # , Yunzhuo Chu 12 # , Hui Wang 1 *.