Received: 27 March 2019
Accepted: 4 June 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: The study protocol was approved by the local Ethics Committees of Xin-Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
: The informed consent had been obtained from the patient's parents specifically for the publication of this manuscript, and it had been in written form.
: The authors declare that they have no competing interests.