Text and Data Mining valid from 2019-03-20
First Online: 20 March 2019
Compliance with Ethical Standards
: The current project was conducted and reported in accordance with PRISMA guidelines.
: No funding was obtained to support the current manuscript.
: Eric T. Trexler, Adam M. Persky, Eric D. Ryan, Todd A. Schwartz, Lee Stoner, and Abbie E. Smith-Ryan declare no conflicts of interest.
: Data for the current analysis are available upon request, and can be obtained by contacting the corresponding author.