Text and Data Mining valid from 2020-01-11
Received: 24 July 2019
Accepted: 30 December 2019
First Online: 11 January 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the institutional and national research committee (registered at the Office for Human Research Protections of the US Departments of Health and Human Services: IRB00002556) 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.