Multimorbidity, health service use, and health insurance by socioeconomic groups in 31 countries: A multi-cohort study. - Wang, Yanshang; Cai, Chang; Shi, Zhenyu; Gao, Qian; Bottle, Alex; Sharabiani, Mansour Taghavi Azar; Stott, Joshua; Hayhoe, Benedict; He, Ping (PLoS Medicine, 2026)