Risk Factors and Predictive Scoring System Development for COVID-19 Death 
CHEN Ling,CHEN Jing,LIU Yuwei,DU Xuebei,PENG Li,JIN Yalei,WANG Haoxiang,ZHAO Yan
Chinese General Practice . 2020, (35): 4419 -4424 .  DOI: 10.12114/j.issn.1007-9572.2020.00.555