Text and Data Mining valid from 2019-10-24
Received: 27 May 2019
Accepted: 9 September 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: 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 1364 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the Ethics Committee of Jilin University (approval no. JLU01527). Written informed consent was obtained from all patients who participated in this study, and their parents (where appropriate).
: Written informed consent for publication was obtained. A copy of the consent form is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.