Before revision:  In this paper, confirmed cases of healthcare workers were used to analyze the impact of under-reporting on the spatiotemporal distribution of COVID-19  . The results show that: (1) the  estimated peak infection time of the reported cases lags behind the actual peak infection time .
After revision:  In this paper, confirmed cases of healthcare workers are considered as accurately small samples to analyze the impact of under-reporting on the spatiotemporal distribution of COVID-19 . The results show that: (1) the estimated peak infection time of the reported cases lags behind the actual peak infection time .