Table 1.
Search terms for Medline
| 1. |
exp Developing Countries/ |
| 2. |
Developing countr*.tw |
| 3. |
(developing adj3 countr*).tw |
| 4. |
africa/ or africa, northern/ or algeria/ or egypt/ or libya/ or morocco/ or tunisia/ or “africa south of the sahara”/ or africa, central/ or cameroon/ or central african republic/ or chad/ or congo/ or “democratic republic of the congo”/ or equatorial guinea/ or gabon/ or africa, eastern/ or burundi/ or djibouti/ or eritrea/ or ethiopia/ or kenya/ or rwanda/ or somalia/ or sudan/ or tanzania/ or uganda/ or africa, southern/ or angola/ or botswana/ or lesotho/ or malawi/ or mozambique/ or namibia/ or south africa/ or swaziland/ or zambia/ or zimbabwe/ or benin/ or burkinafaso/ or cape verde/ or cote d'ivoire/ or gambia/ or ghana/ or guinea/ or guinea–bissau/ or liberia/ or mali/ or mauritania/ or niger/ or nigeria/ or senegal/ or sierra leone/ or togo/ or americas/ or caribbean region/ or west indies/ or “antigua and barbuda”/ or bahamas/ or barbados/ or cuba/ or dominica/ or dominican republic/ or grenada/ or guadeloupe/ or haiti/ or jamaica/ or martinique/ or netherlandsantilles/ or puertorico/ or “saint kitts and nevis”/ or saint lucia/ or “saint vincent and the grenadines”/ or “trinidad and tobago”/ or central america/ or belize/ or costa rica/ or el salvador/ or guatemala/ or honduras/ or nicaragua/ or panama/ or panama canal zone/ or latinamerica/ or mexico/ or south america/ or argentina/ or bolivia/ or brazil/ or chile/ or colombia/ or ecuador/ or frenchguiana/ or guyana/ or paraguay/ or peru/ or suriname/ or uruguay/ or venezuela/ or kazakhstan/ or kyrgyzstan/ or tajikistan/ or turkmenistan/ or uzbekistan/ or borneo/ or brunei/ or cambodia/ or east timor/ or indonesia/ or laos/ or malaysia/ or mekong valley/ or myanmar/ or philippines/ or thailand/ or vietnam/ or bangladesh/ or bhutan/ or india/ or sikkim/ or middle east/ or afghanistan/ or iran/ or iraq/ or israel/ or jordan/ or lebanon/ or saudiarabia/ or syria/ or turkey/ or united arab emirates/ or yemen/ or nepal/ or pakistan/ or srilanka/ or far east/ or china/ or tibet/ or “democratic people's republic of korea”/ or mongolia/ or taiwan/ or albania/ or lithuania/ or bosnia–herzegovina/ or bulgaria/ or “macedonia (republic)”/ or moldova/ or montenegro/ or romania/ or russia/ or bashkiria/ or dagestan/ or moscow/ or siberia/ or serbia/ or ukraine/ or armenia/ or atlantic islands/ or azores/ azerbaijan/ or “georgia (republic)”/ or comoros/ or madagascar/ or mauritius/ or seychelles/ or vanuatu/ or micronesia/ or palau/ or expsamoa/ or americansamoa/ or “independent state of samoa”/ or tonga/ |
| 5. |
exp neural tube defects/ or anencephaly/ or arnold–chiari malformation/ or encephalocele/ or meningocele/ or meningomyelocele/ or “pentalogy of cantrell”/ or exp spinal dysraphism/ or nervous system malformation |
| 6. |
“neural tube defect”.tw |
| 7. |
“neural tube defects”.tw |
| 8. |
NTD.tw |
| 9. |
exp Prevalence/ |
| 10. |
prevalen*.tw |
| 11. |
1 or 2 or 3 or 4 |
| 12. |
5 or 6 or 7 or 8 |
| 13. |
9 or 10 |
| 14. |
11 and 12 and 13 |
| 15. | Limit 14 to (humans and yr = ”2000 –Current”) |