Article History
Received: 6 December 2018
Accepted: 24 June 2019
First Online: 1 August 2019
Ethics approval and consent to participate
: The Institutional Review Board of Peking Union Medical College Hospital approved this study and written informed consent was obtained from all the three patients.
: All three patients in this report have signed the consent forms for publication.
: The authors declare that they have no competing interests.