Funding for this research was provided by:
Guangzhou Science and Technology Project (201806020047)
Guangzhou Institute of Pediatrics/Guangzhou Women and Children’s Medical Center (IP-2016-010)
Received: 16 April 2019
Accepted: 17 October 2019
First Online: 1 November 2019
Ethics approval and consent to participate
: The study received approval from the Ethics Committee of Guangzhou Women and Children’s Medical Center (SFE-KL-23701), and patients or patient guardians signed an informed consent form before participation.
: Not applicable.
: The authors declare that they have no competing interest.