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. 2014 Mar;105(100):140–148. doi: 10.1016/j.socscimed.2013.11.018

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© 2014 The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig. 1 — Percentage of test kits returned by incentive group. Note: Error bars represent 95% confidence intervals. *Difference between incentive and control group is significant at the 85% level.