Funding for this research was provided by:
National Natural Science Foundation of China (81470927, 81770703)
Text and Data Mining valid from 2019-10-23
Received: 15 May 2018
Accepted: 11 September 2019
First Online: 23 October 2019
Ethics approval and consent to participate
: Not applicable.
: The results presented in this paper have not been published previously in whole or part, except in abstract form (36th World Congress of Endourology, Journal of Endourology. Sep 2018. ExternalRef removed). This publication has obtained permission from the copyright holder.
: The authors declare that they have no competing interests.