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. 2020 Sep 10;11:622. doi: 10.3389/fendo.2020.00622

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Copyright © 2020 Khan, Yumnamcha, Mondal, Devi, Rajiv, Labala, Sanjita Devi and Chattoraj.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Pixel brightness (calibrated digital number) mean value 1992–1996 (A), 2000–2004 (B), and 2008–2012 (C); Guangdong and Hong Kong were encircled as the two centers of human coronavirus (HCoV) origin. The figure is used under the terms of the Creative Commons attribution license (128).