Funding for this research was provided by:
Beijing Municipal Administration of Hospitals’ Youth Programme (QML20160303)
Beijing Chao-Yang Hospital 1351 Talents Project Funding (CYXX-2017-11)
Received: 6 July 2019
Accepted: 5 November 2019
First Online: 16 November 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Beijing Chao-Yang Hospital (Project identification code: 2017–Science-71). Because more than half of our patients were from all over the country, follow-up and convalescence data were obtained by telephone contact. All participants were informed about the aims of this study and made the verbal consent.
: Not applicable.
: The authors declare that they have no competing interests.