Associations of serum pepsinogen and Gastrin-17 with Helicobacter pylori infection, sex, and age, in an asymptomatic coastal population: A cross-sectional study in Rizhao, China - Tianyi Zhang; Xiangxiang Meng; Xiaomei Wang; Shanwen Mi; Yanjie Qu; Jianxin Li; Sujun Hou; Yaocai Wang; Mengmeng Yin (PLoS ONE, 2025)