Text and Data Mining valid from 2019-02-20
First Online: 20 February 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: The study was reviewed and approved by University of Pennsylvania’s IRB. 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.
: Informed consent was obtained from all individual participants included in the study.