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. 2020 Jul 1;139:110068. doi: 10.1016/j.chaos.2020.110068

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 4 — Expansion of the disease. A: relative difference of the incidence in 2020 and 2019 in each region by Feb. 5th (Feb. 16th in 2019). B: relative difference in the total number of travelers that went from Hubei to any other region for the period under consideration.