||low weight births by race and ethnicity virginia, prevalence of selected birth defects in texas and other registries, trends in infant mortality rates due to selected congenital anomalies canada, infant mortality rate at five year intervals, medical risk factor by age of mother|
Hints & help
Language. English only please... for now.
Phrase search. You can use double quotes to make phrases (e.g. "mobile phones").
Booleans. You can use a plus ‘+’ to make a word mandatory, or a minus ‘–‘ to exclude it (e.g. +gas –oil production)
Vocabulary. We have only limited synonyms - please try different words in your query.
Questions? Please email us: helpdesk [at] zanran [dot] com