Before revision:  It is freely accessible to the  community as a downloadable package of APIs URL We believe COVID-19 SignSym will provide fundamental supports to the secondary use of EHRs, thus accelerating the global research of COVID-19.
After revision:  It is freely accessible to the research community as a downloadable package of APIs URL We believe COVID-19 SignSym will provide fundamental supports to the secondary use of EHRs, thus accelerating the global research of COVID-19.