Received: 2 April 2020
Accepted: 13 May 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: This prospective observational study was approved by the Institutional Review Board of China Resources & WISCO General Hospital. Informed consent was waived by the review board due to the observational nature of the study and the epidemic of COVID-19 as an emergency public health event.
: Not applicable.
: The authors declare that they have no competing interests.