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

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

Or ↓ <Migration> And → <Cancer> Or → <Heart Disease> Or → <Diabetes>
  Subject headings
   Human migrationa   Neoplasmsa   Heart Diseasesa   Diabetes Mellitusa
   Emigrants and immigrantsa       
   Transients and migrantsa       
   Residential Mobilityb       
   Migrant/foreign workerc       
   Medical Tourism/Travel medicinea       
  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
      
  1. aMedline subject heading. Similar subject headings were found and used in other databases where available
  2. bCINAHL subject heading. Similar subject headings were found and used in other databases where available
  3. cEmbase subject heading. Similar subject headings were found and used in other databases where available