Funding for this research was provided by:
National Natural Science Foundation of China (No. 81471670)
Received: 6 July 2019
Accepted: 25 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: This study was approved by The First Affiliated Hospital, College of Medicine, Zhejiang University. The data released from the Global Health Data Exchange query did not require informed patient consent.
: Not applicable.
: The authors declare that they have no competing interests.