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Article History

Received: 15 April 2015

Accepted: 30 August 2015

First Online: 19 October 2015

Compliance with ethical standards

:

: Wan Yue-Meng, Li-Hong Yang, Jin-Hui Yang, Ying Xu, Jing Yang, Gui-Bo Song declare that they have no conflicts of interest.

: All procedures followed were in accordance with the ethical standards of the ethics committee of the Second Affiliated Hospital of Kunming Medical University on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008.

: All patients offered written informed consent before initiation of ETV or ETV plus PE.

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