Funding for this research was provided by:
National Institute on Aging (NIA U01AG009740)
Received: 30 June 2017
Accepted: 20 February 2018
First Online: 9 March 2018
Ethics approval and consent to participate
: This study uses a public use dataset and therefore does not require additional Institutional Review Board approval. Primary data collection for the Health and Retirement Study was approved thorough the University of Michigan Institutional Review Board.
: Not applicable.
: The authors declare they have no competing interests.
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