Text and Data Mining valid from 2019-03-30
Received: 24 December 2018
Accepted: 25 March 2019
First Online: 30 March 2019
Compliance with ethical standards
: All authors declared no conflicts of interest.
: This study was reviewed and approved by the Institutional Review Board (IRB). The study was also conducted in accordance with the ethical standards of the institutional and/or national research committee, 1964 Helsinki Declaration and subsequent amendments, or similar ethical standards.