Received: 5 October 2019
Accepted: 2 March 2020
First Online: 17 March 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Commission of Affiliated Hangzhou First People’s Hospital, Zhejiang University School of Medicine. Permission to carry out the study and access patient records was sought from the respective hospital administrators.
: Written consent for publication of this anonymous information was obtained from the patient’s parents and the proof of consent can be requested at any time.
: The authors declare that they have no competing interests.