Randomized controlled comparison of cross-sectional survey approaches to optimize follow-up completeness in clinical studies
2019
Introduction
In outcome research, incomplete follow-up is a major, yet potentially correctable source of bias. Cross-sectional surveys may theoretically increase completeness of follow-up, but low response rates are reported typically. We investigated whether a pre-notification letter improved patient availability for follow-up phone interviews and thereby improved cross-sectional survey yield.
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