Zhang, Heqing
Qiu, Li
Peng, Yulan
Funding for this research was provided by:
National Natural Science Foundation of China (81571694)
Article History
Received: 1 June 2018
Accepted: 17 July 2018
First Online: 24 July 2018
Ethics approval and consent to participate
: Our database was password protected, the study was approved by Ethics Committee of West China Hospital, and all participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.