Text and Data Mining valid from 2019-09-19
First Online: 19 September 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: Ethics Statement All procedures performed were in accordance with the ethical standards of the institutional research committee (IRB approval provided by University of Minnesota) 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.