Article History
Received: 1 November 2018
Accepted: 27 March 2019
First Online: 8 April 2019
Competing interest
: Each author declares that they have no competing interests, and certifies that he has no commercial association (e.g. consultancies, stock ownership, equity interest, patent/licensing arrangement, etc.) that might pose a conflict of interest in connection with the submitted article.
: This study was approved by the Ethics Committee of the West China Second University Hospital and written informed consent was obtained from parents of the child.
: The study obtained informed written consent from the parents of the study participants in order to publish their clinical details and clinical images.
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