The relationship between non-permanent migration and non-communicable chronic disease outcomes for cancer, heart disease and diabetes – a systematic review

Table 1 Examples of keywords and Boolean operators used in electronic database searches

<Migration>	<Cancer>	<Heart Disease>	<Diabetes>
Subject headings
Human migration^a	Neoplasms^a	Heart Diseases^a	Diabetes Mellitus^a
Emigrants and immigrants^a
Transients and migrants^a
Residential Mobility^b
Migrant/foreign worker^c
Medical Tourism/Travel medicine^a
Text words (concepts to cover different types of migration by attributes)
Geography	Tumor	Cardiovascular disease	Diabet*
• Borders/Cross-border • Bi/transnational • Rural/urban • Regional
Patterns/Frequency	Cancer	Ischemic heart disease
• Return • Temporary • Regular • Circular
Populations	Carcino/Onco	Myocardial Infarction
• Mobile • Floating • Seasonal • Worker/farmworker

^aMedline subject heading. Similar subject headings were found and used in other databases where available
^bCINAHL subject heading. Similar subject headings were found and used in other databases where available
^cEmbase subject heading. Similar subject headings were found and used in other databases where available

ISSN: 1471-2458