The four are Yao Qingqiang, director of Orthopedics at Nanjing First Hospital; Xue Fei, GM at Yuecheng Construction; Ma Chengjun, a police officer at Jiangning PSB; and Li Quanjun, a director at Gaochun Emergency Management. Full story (in Chinese) via this link; read about Nanjing introduced as never before via this link.