Funding for this research was provided by:
Medical Scientific Research Foundation of Guangdong Province, China (A2017385)
Shantou Science and Technology Project ( No.182)
Received: 17 August 2018
Accepted: 12 April 2019
First Online: 29 April 2019
Ethics approval and consent to participate
: The study was approved by the ethic committee. Informed consent was obtained.
: The publication of this review was approved by the Ethics Committee of Ospedale Santa Maria della Misericordia, Perugia, Italy. Written informed consent was obtained from either the parent(s) or legal guardian(s) of each patient mentioned in the review, and the children who were aged > 8 years signed to confirm their consent.
: The authors declare that they have no competing interests.
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