Funding for this research was provided by:
Chinese National Science & Technology Pillar Program (2020YFC2005600,2020YFC2005604)
Sichuan Science and Technology Program (2020YFS0148)
1·3·5 project for disciplines of excellence–Clinical Research Incubation Project, West China Hospital, Sichuan University (19HXFH012)
National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University (Z20191003)
Project of Novel Coronavirus Pneumonia in West China Hospital (HX2019nCoV027)
Received: 15 May 2020
Accepted: 24 August 2020
First Online: 7 September 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of West China Hospital (West China Hospital #2020198). Informed verbal consent was obtained from all participants. The requirement for written consent was waived by the Ethics Commission.
: Not applicable.
: The authors declare that they have no competing interests.