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Each participant received remuneration for the samples they provided: $10 gift cards per hair and stool sample and $5 gift cards per urine sample. Thus, participants could receive up to $50 (up to $100 per dyad) if they provided all samples at baseline and post-intervention visits. An additional $5 gift card was also provided to compensate those who made an extra trip (outside pre-planned times) to deliver specimens. Compensation was provided at the time of sample drop-off.
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