Funding for this research was provided by:
West China Hospital (HX2019nCoV027)
Received: 12 May 2020
Accepted: 20 May 2020
First Online: 5 June 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the West China Hospital of Sichuan University.
: Not applicable.
: The authors declare that they have no competing interests.