Text and Data Mining valid from 2020-01-11
Received: 16 November 2019
Revised: 16 November 2019
Accepted: 2 January 2020
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/or national research committee (the institutional review board of St. Luke’s International Hospital, 19-R078) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study, formal consent is not required.