(Q51005527)
Statements
Pragmatic and internal validity issues in sampling in caregiver studies: a comparison of population-based, registry-based, and ancillary studies. (English)
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Thomas Fritsch
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Judith D Kasper
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Kathleen A Smyth
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Lisa Fredman
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Sharon Tennstedt
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Baila Miller
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Maura Watson
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Emily L Harris
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1 January 2004
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16
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175-203
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