The affiliation of authors of academic papers is usually indicated by the footnotes associated with the authors names. You will see some small letters like supe

The affiliation of authors of academic papers is usually indicated by the footnotes associated with the authors names. You will see some small letters like superscripts next to the authors names. All of them list one or two affiliations with the first one being (a): State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, 430071, China