Members of the Chinese medical expert team to Serbia, Guo Yubiao, Lin Bingliang, Hou Cailan, Peng Zhiqiang, Long Qisui and Xiong Yan (L to R), wave before leaving at the Health Commission of Guangdong Province in Guangzhou, capital of South China's Guangdong province, on March 21, 2020. [Xinhua/Liu Dawei]