Shen, Yang
Wang, Yanling
Chang, Chun
Li, Suning
Li, Weihao
Ni, Bingying
Article History
Received: 26 July 2018
Revised: 24 November 2018
Accepted: 30 November 2018
First Online: 3 January 2019
Compliance with ethical standards
:
: None.
: 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.