Text and Data Mining valid from 2019-09-18
Received: 15 May 2019
Accepted: 4 September 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Hunan Children’s Hospital (Approval No. HCHLL-2016-015). The samples were obtained appropriate informed consent from all participants.
: Not applicable.
: The authors declare that they have no competing interests.