![](/img/cover-not-exists.png)
Pragmatic and Internal Validity Issues in Sampling in Caregiver Studies: A Comparison of Population-Based, Registry-Based, and Ancillary Studies
Fredman, Lisa, Tennstedt, Sharon, Smyth, Kathleen A., Kasper, Judith D., Miller, Baila, Fritsch, Thomas, Watson, Maura, Harris, Emily L.Volume:
16
Language:
english
Journal:
Journal of Aging and Health
DOI:
10.1177/0898264303262639
Date:
April, 2004
File:
PDF, 131 KB
english, 2004