Funding for this research was provided by:
Health and Family Planning Commission Foundation of Hubei province, China (WJ2015MB260)
Research Fund for Excellent Dissertation of China Three Gorges University (2018SSPY094)
Article History
Received: 5 May 2018
Accepted: 23 June 2018
First Online: 20 August 2018
Compliance with ethical guidelines
:
: G. He, Q. Li, W. Li, Y. Ruan, X. Xiong, X. Song, and F. Zeng 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.