Funding for this research was provided by:
the National Science Foundation of China (81570489)
Received: 12 October 2017
Accepted: 3 May 2018
First Online: 28 June 2018
Ethics approval and consent to participate
: This article is a retrospective study and does not contain any studies with human subjects performed by any of the authors. So, the ethical approval was not necessary and the General Hospital of Tianjin Medical University medical ethics committee can offer exempt ethical statement in support.
: Written informed consent was obtained from the patients for publication of this case reports and any accompanying images. A copy of the written consent is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.
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