Universal health coverage for refugees and migrants in the twenty-first century.

Migration is a determinant of health. Tackling the health needs of migrants and refugees will require action at the local, national, and global levels. Over the past 12 months, BMC Medicine has published a collection of articles under the title Migrant and Refugee Health ( https://www.biomedcentral.com/collections/migrant-and-refugee-health ) addressing a range of health issues affecting refugees and migrants in their countries of origin, on transit, and in their destination countries. In light of these articles, we herein discuss the complex and wide-ranging healthcare needs of different refugee groups in their destination countries as well as the need for accessible and culturally appropriate health services.