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. 2020 May 29;138:109949. doi: 10.1016/j.chaos.2020.109949

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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 — Effect of re-establishment of strict interventions. (A) Representative trajectory for implementation of strict intervention started on April 20. F was set to either 1 or 2 since April 20. Before April 20, F=7 because F=7 could better match the reported epidemic data. (B) Distribution of time to peak (left) and recovery time (right) since April 9 (when the first domestically diagnosed patient emerged). The dashed lines denote the mean values. The contact factor F=1. (C) Similar as in (B) for F=2. Kernel density estimation was used.