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Evaluation of offering an incentive before or after completion of a 2-year follow-up postal questionnaire on the response rate in parents of preterm babies

SWAT: 69

Objective of this SWAT:

To establish whether offering an unconditional incentive in advance (with the first mailing of a questionnaire) or promising an incentive (in the first mailing) on completion of a questionnaire (conditional) to the parents of preterm babies improves the response rate


In Progress


Please click the links below to access the registered protocol or SWAT download bundle which includes:
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