Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (107-2221-E-006-198-MY2)
Received: 1 December 2019
Accepted: 6 March 2020
First Online: 14 March 2020
Ethics approval and consent to participate
: This study was approved by the Clinical Trial and Research Ethical Committee, National Cheng Kung University Hospital (IRB No. B-B103–108). Informed written consent was obtained from a parent or legal guardian for each participant in the study.
: Not applicable.
: The authors declare that they have no competing interests.