Received: 24 April 2019
Accepted: 22 July 2019
First Online: 1 August 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the University of Yamanashi Hospital and was performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments.
: Informed consent was obtained from the patients for publication and accompanying images.
: The authors declare that they have no competing interests.