Pragmatic and internal validity issues in sampling in caregiver studies: a comparison of population-based, registry-based, and ancillary studies.

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Published in J Aging Health on January 01, 2004

Authors

Lisa Fredman1, Sharon Tennstedt, Kathleen A Smyth, Judith D Kasper, Baila Miller, Thomas Fritsch, Maura Watson, Emily L Harris

Author Affiliations

1: Department of Epidemiology, Boston University School of Public Health, Boston, MA 02118, USA.

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