Fig. 2From: China’s practice to prevent and control COVID-19 in the context of large population movementComparison of inter-regional emigration indexes in Guangdong, Zhejiang, Hubei, Wuhan, Beijing, and Shanghai between 2019 and 2020. The bigger the emigration index is, the more the population size of emigrating from the areas is. The dates have been adjusted according to Chinese Calendar, so as to make comparisons comparability between 2019 and 2020Back to article page