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. 2021 Jun 9;223(2):395–403. doi: 10.1016/j.amjsurg.2021.05.018

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© 2021 Published by Elsevier Inc.

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. 1 — Cumulative cases and 7-Day average of new COVID-19 Infections¹³ The total number of COVID-19 cases and 7-day average, respectively, at the end of each survey period was reported by the US COVID Atlas as follows: spring – June 26, 2020–2,450,318 and 34,623; summer - July 14- September 3, 2020 6,070,879 and 40,337; Winter -December 7- January 11, 2021–22,249,686 and 242,989.¹³