M Ou, J Zhu, P Ji, H Li, Z Zhong, B Li, J Pang… - Epidemiology & …, 2020 - cambridge.org
… ill COVID-19 patients from 1 January 2020 to 3 April 2020. In the end, we meta-analysed 40
studies involving 5872 COVID-19 … the risk factors of severe COVID-19, we meta-analysed the …