id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-325012-yjay3t38	Chen, Ze-Liang	Distribution of the COVID-19 epidemic and correlation with population emigration from Wuhan, China	2020-02-28		.txt	text/plain	3839	227	60	Data on population migration from Wuhan city and Hubei province were extracted from Baidu Qianxi, and their correlation with the number of cases was analyzed. The relative risk according to time increased steadily from January 20 onwards and the upward trend continued as of January 30 [ Figure 2C ], indicating that the number of cases nationwide is on the rise. From January 1 to 23, 2020, the population that migrated out of Wuhan city and Hubei province increased steadily, peaking on January 21 and 22 [ Figure 4A ]. To analyze the correlation between the number of cases and the emigration in Wuhan city and Hubei province, population migration data were collected from Baidu Qianxi. The correlation coefficient between the provincial number of cases and emigration from Wuhan increased to 0.943, with the highest coefficient of 0.996 observed between Wuhan and other cities of Hubei provinces [ Figure 4E and 4F; Supplementary Tables 3 and 4 , http://links.lww.com/ CM9/A210].	./cache/cord-325012-yjay3t38.txt	./txt/cord-325012-yjay3t38.txt