Study retention as bias reduction in a hard-to-reach population.
Proc Natl Acad Sci U S A. 2016 May 17;113(20):5477-85. doi: 10.1073/pnas.1604138113. Epub 2016 May 9.
Proc Natl Acad Sci U S A. 2016.
PMID: 27162332
Free PMC article.