Health aspects of the pre-departure phase of migration
The flow of populations within and across international boundaries is an important element in today's globalized world. Recent estimates of migration patterns place the combined numbers of international migrants and internal migrants at nearly a billion people. Although migrant populations are extremely diverse, the processes of migration include certain characteristics shared by all migrants. All migrants have a place of origin. Experiences and exposures at a place of origin can influence migrants' health throughout the process of mobility, which may include transition, temporary residence, and arrival at a destination. After arrival or settlement, some migrant cohorts may experience ongoing or return migrations that can also have health consequences.
http://www.plosmedicine.org/article/info:doi/10.1371/journal.pmed.1001035