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E
Edwards, P;
Roberts, I;
Clarke, M;
DiGuiseppi, C;
Pratap, S;
Wentz, R;
Kwan, I;
(2002)
Increasing response rates to postal questionnaires: systematic review.
BMJ (Clinical research ed), 324 (7347).
pp. 1183-5.
ISSN 0959-8138
DOI: https://doi.org/10.1136/bmj.324.7347.1183