A systematic review of the effect of retention methods in population-based cohort studies
1 MRC/CSO Social and Public Health Sciences Unit, Glasgow, UK
2 University of Essex, Institute for Social & Economic Research, Colchester, UK
BMC Public Health 2011, 11:249 doi:10.1186/1471-2458-11-249Published: 19 April 2011
Additional file 1:
Is an example of the electronic database search for retention/attrition in cohort studies.
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