Acknowledgments
The authors thank Mr. Trevor Ralph for his English proofreading.
Authors’ contributions
SY, YM, and SS wrote the manuscript. SY, YM, SS, KK, HM, EO, KH, YF, TK, MN, TF, KS, and YN contributed to patient care. SY, YM, SS, and KK acquired and analyzed patient data. SS, KS, and YN supervised patient care. All authors critically revised the manuscript and have approved the final version.
Consent for publication
Written informed consent was obtained from the parents.
Disclosure statement
The authors declare no conflicts of interest.