Text and Data Mining valid from 2019-11-14
Received: 17 June 2019
Accepted: 6 November 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: All participants or their legal representatives signed informed consent and the study was approved by the Ethics Committee of Beijing Children’s Hospital Affiliated to Capital Medical University.
: The patient’s parents had written informed consent to publish this information.
: The authors declare that they have no competing interests.