Your inbox probably has more invitations to join online health research surveys than
before the COVID-19 pandemic. Online surveys have become an important tool for COVID-19
research when conventional survey methods are not feasible. Yet the response to COVID-19
has also underlined the urgent need for high-quality behavioural data. Is the trend
towards online health survey research an indication of practices to come or a stark
reminder of the perils of convenient sampling methods? This Comment examines unique
opportunities associated with online health research surveys, challenges in implementing
and interpreting data from online surveys, and considerations for getting the most
out of online health research.

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