A recovered patient infected with novel coronavirus pneumonia (NCP) waves goodbye to medical staff at the 4th People's Hospital of Qinghai Province in Xining, northwest China's Qinghai Province, Feb. 21, 2020. Two more NCP patients in Qinghai Province recovered and were discharged from hospital on Friday. So far, a total of 18 confirmed cases in Qinghai Province have been cured and discharged. (Xinhua/Zhang Long)