Methods Design An integrative literature allows for the inclusion of multiple research methods, experimental and non-experimental designs, and theoretical, as well as empirical data, to increase understanding of a specifi c topic.8 Th e results of this type of review can inform clinical practice and health policy, in addition to supporting theory development.9 Our goal was not to determine health outcomes related to a specifi c intervention, as is common to systematic reviews, but to characterize the state of our knowledge related to mental health problems among migrant workers in Asian countries