Telephone interviews can be used to collect follow-up data subsequent to no response to postal questionnaires in clinical trials

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• Telephone interviews can be used to collect follow-up data subsequent to no response to postal questionnaires in clinical trials.
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• Response and non-response to postal questionnaire follow-up in a clinical trial--a qualitative study of the patient's perspective.
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• Maximising response to postal questionnaires – A systematic review of randomised trials in health research
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