Funding for this research was provided by:
National Center for Advancing Translational Sciences (1UL1TR001079)
National Institute of Mental Health (R25MH083620)
National Cancer Institute (K01CA184288, P30CA006973, P30CA006973, R01CA106851, 1U54CA155850)
National Institute of Allergy and Infectious Diseases (P30AI094189)
National Institute on Aging (K01AG04176)
Received: 18 September 2017
Accepted: 11 December 2017
First Online: 25 January 2018
Compliance with ethical standards
: 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. The study was approved by the Institutional Review Board of the University of Pennsylvania. Informed consent was obtained from all individual participants included in the study, prior to any data collection.
: The authors declare that they have no conflicts of interest.