How references appear
Each guide and calculator lists the sources used for its substantive claims. Numbered links near a section point to that page's reference list. The library below is a starting map of frequently used institutions, not a substitute for the page-specific references.
What we look for
We prioritize the source that is closest to the claim: official guidance for public-health recommendations, original research for a prediction equation, and systematic reviews for a broad evidence question. We check publication date, population, method, and whether the source actually supports the surrounding sentence.
When credible sources use different definitions or ranges, the article should explain the disagreement instead of combining the numbers into false precision. Calculator pages state whether the result is measured, predicted, or a population reference.
How readers can verify a page
Start with the references on the specific article, open the source linked beside the relevant claim, and check its population and date. For a formula, compare the displayed equation and units with the original paper or guidance. Questions or conflicting evidence can be sent to Yanhua through the public editorial contact for review.