Received: 14 January 2020
Accepted: 28 February 2020
First Online: 5 March 2020
Ethics approval and consent to participate
: All of this study complied with the requirement of “The Ethics of Clinical Research” issued by Ministry of Health and Welfare, Korea. All procedures performed were in accordance with the ethical standards of “Pusan National University School of Medicine Research Committee”.
: A written informed consent was obtained from the parents of patients for publication of this case report.
: The authors declare that they have no competing interests.