Involvement of liver in COVID-19: systematic review and meta-analysis - Yadav, Dipesh Kumar; Singh, Akanand; Zhang, Qi; Bai, Xueli; Zhang, Wei; Yadav, Rajesh Kumar; Singh, Alina; Zhiwei, Li; Adhikari, Vishnu Prasad; Liang, Tingbo (Gut, 2021)