Funding for this research was provided by:
the Pilot Fund of Beijing Lisheng Cardiovascular Health Foundation (No. LHJJ20144210)
Text and Data Mining valid from 2019-01-10
Received: 14 August 2018
Accepted: 27 December 2018
First Online: 10 January 2019
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.