Received: 8 September 2018
Accepted: 29 August 2019
First Online: 25 October 2019
Ethics approval and consent to participate
: All procedures performed 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. This study was approved by the Institutional Review Board of Taichung Veterans General Hospital (No. CE18102A). We confirmed that informed consent obtained to participate in this study was written or verbal from participants (or their parent or guardian).
: We confirmed that participants (or their parent or guardian) gave informed consent for publication through written or verbal consent.
: The authors declare that they have no competing interests.