Nevertheless, we saw an increasing trend across the 2 phases, with overall survey completion being 3.7% (162/4350), 3.8% (166/4351), 3.8% (166/4350), 4.4% (192/4351), and 4.4% (193/4351) for the US $0, $10, $20, $50, and $75 groups, respectively (based on phase 1 randomization).
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Impact of Incentives on Physician Participation in Research Surveys: Randomized Experiment.
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