TABLE 1.
Population demographics
| Population | Profile | Socioeconomic status | No. infants sampled |
|---|---|---|---|
| Evanston | Urban USA | High | 25 |
| Xalapa | Urban MEX | Middle | 7 |
| Coatepec | Peri-urban MEX | Low | 7 |
| Ocotepec | Rural MEX | Low | 8 |
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