Cai, Yonghua
Gu, Wei
Wang, Jian
Funding for this research was provided by:
Nature Science Foundation of Beijing (7192171)
Article History
Received: 11 February 2020
Accepted: 16 March 2020
First Online: 25 March 2020
Compliance with ethical standardsx
:
: The authors have no conflict of interest to disclose.
: This retrospective case–control study was approved by the local Ethics Committee.
: This was retrospective study, thus no informed consent was needed.