Prevalence of hepatitis E virus in swine in China: a systematic review with meta-analysis (2004–2023) - He, Zhenwen; Liu, Dingyu; Liu, Baoling; Zhang, Pian; Wang, Xiaohu; Wang, Gang; Huang, Yuan; Chen, Jing; Cai, Rujian (Frontiers in Veterinary Science, 2025)