Received: 26 February 2020
Accepted: 25 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: Written informed consent was obtained from the mother for both herself and her child, and this study was approved by the ethical board of Akita University Graduate School of Medicine and Faculty of Medicine. (approval number:2392).
: Written informed consent was obtained from the mother for both herself and her child for the procedure, publication of this case report and accompanying images.
: The authors declare that they have no competing interests.