Funding for this research was provided by:
the National Key Research Project on Prevention and Control of Chronic Non-communicable Diseases of the Ministry of Science and Technology (2016YFC1300800)
Text and Data Mining valid from 2019-12-01
Received: 18 June 2019
Accepted: 11 December 2019
First Online: 20 December 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Xuanwu Hospital Ethics Review Committee (Clinical Research Council 024). For this type of study, formal consent is not required.
: Not applicable.
: The authors declare that they have no competing interests.