Zhu, Ruifeng
Zhang, Yuhua
Wang, Jing
Yue, Chaochao
Fang, Wenhui
Dang, Jiaqi
Zhao, Hong
Li, Zengxi
Article History
Received: 11 June 2019
Revised: 23 July 2019
Accepted: 15 August 2019
First Online: 11 September 2019
Compliance with ethical standards
: The study was approved by the Health Center of the University of Chinese Academy of Sciences and was performed in accordance with ethical standards. Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.