Zhang, Fanghua
Wang, Meng
Yang, Junjie
Xu, Qian
Liang, Cheng
Chen, Bin
Zhang, Jiaming
Yang, Ying
Wang, Huiling
Shang, Yongfang
Wang, Ye
Mu, Xiaofeng
Zhu, Dequan
Zhang, Chunling
Yao, Minxiu
Zhang, Lei
Article History
Received: 25 February 2019
Accepted: 1 August 2019
First Online: 13 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: 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 Declaration of Helsinki and its later amendments or comparable ethical standards. Research involving human participants and/or animals: this article does not contain any studies with animals performed by any of the authors.
: All the subjects signed informed consent beforehand and belonged to the same geographical area. Data were collected by using a standardized questionnaire, including basic information, medical history, and examination results.