Professor Zhou Xin checks the condition of a patient to be tested at the Wuhan Institute of Physics and Mathematics of the Chinese Academy of Sciences in Wuhan, capital of central China's Hubei Province, April 18, 2019. The Wuhan Institute of Physics and Mathematics of the Chinese Academy of Sciences is a state key laboratory of magnetic resonance and atomic and molecular physics, and a national center for magnetic resonance. (Xinhua/Jin Liwang)