Biology, 17.12.2019 17:31 tonyiacamper1

British investigators conducted a study to examine measles- mumps-rubella (mmr) vaccine history among 1,294 children with pervasive development disorder (e. g., autism and asperger's syndrome) and 4,469 children without such disorders. (they found no association.) this is an example of which type(s) of study?
a. randomize control trial
b. case-control
c. cross-sectional
d. retrospective cohort

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British investigators conducted a study to examine measles- mumps-rubella (mmr) vaccine history amon...