Table 1: Criteria for inclusion of journal articles.

General categorySpecific inclusion criteria

ChemicalArsenic, cadmium, lead, or mercury
CountryBrazil, China, India, Indonesia, Mexico, Poland, Russia, South Korea, Taiwan, or Turkey
Age≤18 years
Matrix analyzedBlood or urine
LanguageEnglish only
Evidence of contamination or adverse health effectsContains data on either levels of metal contamination in matrix analyzed or adverse health effects for population of interest