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How about the Cochrane Collaboration? For example, MMR vaccines Vaccines for the common cold influenza vaccines


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According to https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1115047/ a hymen appears to be absent in < 0.03% patients (citation of a much older paper: https://pubmed.ncbi.nlm.nih.gov/3627892/).


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