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Check date values in: |date= (help) ↑ Einarson, Thomas R.; Piwko, Charles; Koren, Gideon (2013-01-01). « Prevalence of nausea and vomiting of pregnancy in the USA: a meta analysis ».
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PMID 26348534. doi:10.1002/14651858.CD007575.pub4. ↑ Einarson, Thomas R.; Piwko, Charles; Koren, Gideon (2013-01-01). "Prevalence of nausea and vomiting of pregnancy in the USA: a meta analysis".