Funding for this research was provided by:
Retirement Research Foundation
National Center for Advancing Translational Sciences (UL1TR001998)
Text and Data Mining valid from 2018-06-08
First Online: 8 June 2018
Compliance with Ethical Standards
: On behalf of all authors, the corresponding author states that there is no conflict of interest.
: This study was conducted with the approval of the university Institutional Review Board; informed consent was obtained from grandparents and informed assent was obtained from grandchildren.