Funding for this research was provided by:
the Science and Technology Bureau of Luzhou City (2016-S-67)
Received: 28 August 2018
Accepted: 13 June 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: This study was approved by an independent ethics committee/institutional review board at Department of dermatology, Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China (NO: K2018011-R). All patients-related procedures and protocol were approved under the guidelines of the <i>Declaration of Helsinki</i>. Written informed consent was obtained from each participant guardian included in the study.
: Not applicable.
: The authors declare that they have no competing interests.