A boy has his blood sample collected at Children's Hospital of Fudan University in east China's Shanghai, July 26, 2018. Shanghai Meteorological Bureau issued an orange alert for high temperature on Thursday as about 37 degrees Celsius is expected in the municipality. (Xinhua/Liu Ying)

People wait for medical treatment at Children's Hospital of Fudan University in east China's Shanghai, July 26, 2018. Shanghai Meteorological Bureau issued an orange alert for high temperature on Thursday as about 37 degrees Celsius is expected in the municipality. (Xinhua/Liu Ying)

People wait for medical treatment at Children's Hospital of Fudan University in east China's Shanghai, July 26, 2018. Shanghai Meteorological Bureau issued an orange alert for high temperature on Thursday as about 37 degrees Celsius is expected in the municipality. (Xinhua/Liu Ying)