Funding for this research was provided by:
Health Research Services Administration (U90HA22702)
Text and Data Mining valid from 2018-05-24
First Online: 24 May 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures involving human participants were in accordance with the ethical standards for the institutional review board and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study. No personal identifying information is included in the manuscript.