Risk Factors for Gastrointestinal Bleeding in Patients With Acute Myocardial Infarction: Multicenter Retrospective Cohort Study - Yanqi Kou; Shicai Ye; Yuan Tian; Ke Yang; Ling Qin; Zhe Huang; Botao Luo; Yanping Ha; Liping Zhan; Ruyin Ye; Yujie Huang; Qing Zhang; et al. (Journal of Medical Internet Research)