Funding for this research was provided by:
Natural Science Foundation of Fujian Province (No. 2016J01644)
Natural Science Foundation of Fujian Province (2016J01644)
Received: 30 December 2018
Accepted: 8 May 2019
First Online: 13 June 2019
Ethics approval and consent to participate
: Ethical clearance was obtained from Ethical Review Board of the First Affiliated Hospital of Xiamen University conforming to the institutional ethical guidance (KY2015–027). All private information, including patient ID, residence and contact information is crypted and hashed. As no private information is revealed in this study, the review board agreed to waive the statement of consent. The usage of the patient records was authorized by the director of the Pediatric Department in the scientific management system.
: Not Applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.