国家重点研发计划2018YFC1311900;中央高校基本科研业务费专项资金北京大学疫情防控公关专项BMU2020HKYZX011;National Key R & D Program of China2018YFC1311900;Fundamental Research Funds for the Central Universities and Special Research Fund of PKU for Prevention and Control of COVID-19BMU2020HKYZX011