Received: 12 September 2019
Accepted: 18 March 2020
First Online: 7 April 2020
Ethics approval and consent to participate
: All procedures were performed in a bioassay laboratory and approved by the local ethics committee of Hanoi Medical University Hospital and Institute of biotechnology, Vietnam Academy of Science and Technology (Ha Noi, Viet Nam).
: The parent of the patient consented to the publication of the case and any accompanying images with written consent.
: The authors declare that they have no competing interests.