Text and Data Mining valid from 2019-11-18
Received: 6 November 2018
Accepted: 6 September 2019
First Online: 18 November 2019
: <b>Compliance and ethics</b> The author(s) declare that they have no conflict of interest. This study was approved by the Ethics Committee of Wuhan Children’s Hospital (Wuhan Maternal and Child Healthcare Hospital), Tongji Medical College, and Huazhong University of Science & Technology. Informed consent was obtained from all participants.