Li, Liangliang
Yi, Zhi
Xi, Hongmin
Ma, Lili
Shao, Hui
Wang, Wenwen
Pan, Hong
Li, Miaomiao
Jiang, Hong
Article History
Received: 26 February 2019
Accepted: 25 July 2019
First Online: 23 August 2019
Ethics approval and consent to participate
: Study approval and ethical clearance was obtained from the the affiliated hospital of Qingdao university. Written consent was obtained from the guardian of the child prior to data collection.
: We obtained the written consent for publication from the guardian of the patient.
: The authors declare that they have no competing interests.