asymp.tex

\documentclass[pre,byrevtex,superscriptaddress,12pt,pdftex]{revtex4}

% for full names in referenes
\bibliographystyle{naturemag}

\input{settings.tex}
\setboolean{twocolswitch}{true}
\setboolean{revtexswitch}{true}

%%%%%%%%% author(s), address(es) plus abstract

\begin{document}

\title{
  \input{title.tex}
}

\input{author.tex}

\date{\today}

\begin{abstract}
  \input{abs.tex}
\end{abstract}

\maketitle

%%%%%%%%% end of author(s), address(es) plus abstract

% \input{research.in.context.tex}

\pagebreak

\input{short.body.tex}

\input{acknowledge.tex}

\input{appendix.tex}

\pagebreak

\bibliography{coronavirus.bib}

\end{document}