The trend of direct medical costs and associated factors in patients with chronic hepatitis B in Guangzhou, China: an eight-year retrospective cohort study. - Shuo Yang; Ge Chen; Yueping Li; Guanhai Li; Yingfang Liang; Feng Zhou; Shudong Zhou; Yi Yang; Weidong Jia; Yanhui Gao; Yue Chen (BMC Medical Informatics Decis. Mak., 2021)