Zhang, Yu
Zeng, Na
Zhang, FengBo
Huang, YangXinRui
Tian, Ye
Article History
Received: 28 June 2019
Accepted: 4 August 2019
First Online: 31 August 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors; and it receives ethics approval from Capital Medical University affiliated Beijing Friendship Hospital Ethics Committee.
: No informed consent was obtained because we applied for exception to informed consent from our ethics committee.