Integrated care: learning between high-income, and low- and middle-income country health systems

Integration is a challenging concept to define, in part because of its multiple dimensions and varied scope: from integrated clinical care for individual patients to broader systems integration- or linkage-involving wide range of interconnected services. This commentary compares integrated care in high-and lower- income countries. Although contexts may differ significantly between these settings, there are many common features of how integration has been understood and common challenges in its implementation