Increasing response rates to postal questionnaires: systematic review.
Edwards, Phil; Roberts, Ian; Clarke, Mike; DiGuiseppi, Carolyn; Pratap, Sarah; Wentz, Reinhard; Kwan, Irene; BMJ: British Medical Journal (International Edition), 2002, vol. 324, issue 7347, p 1183, ISSN 09598146. ISBN 17561833.

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