Funding for this research was provided by:
National Institute on Aging (R01 AG042407)
Article History
Accepted: 12 December 2017
First Online: 16 December 2017
Compliance with ethical standards
:
: A.A.S. is a Senior Scientist with the Gallup Organization and a consultant with Adelphi Values, inc. S.S. and M.M. declare that they have no conflict of interest.
: The study was approved by the University of Southern California Institutional Review Board. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.