Yu, Q. A.
Ma, D. K.
Liu, K. P.
Wang, P.
Xie, C. M.
Wu, Y. H.
Dai, W. J.
Jiang, H. C.
Article History
Received: 28 January 2018
Accepted: 9 March 2018
First Online: 17 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interests or financial interest invested in this work.
: This study was approved by the ethics committee of First Ailiated Hospital of Harbin Medical University. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: For this type of study formal consent is not required.