\documentclass[10pt]{article}
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%     Please do not change the following 
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\RequirePackage[a4paper]{geometry}
\geometry{top=25mm,bottom=25mm,left=25mm,right=25mm,nohead,nofoot,includeheadfoot}
\pagestyle{empty}
\usepackage[utf8]{inputenc} % input encoding can be adjusted as needed
\usepackage{mathptmx,graphicx}
\newcommand{\AbstractTitle}[1]{{\Large\bfseries #1 \par}\vspace{3ex}}
\newcommand{\AbstractAuthors}[1]{{\bfseries #1 \par}}
\renewcommand{\thefootnote}{\fnsymbol{footnote}}
\newcommand{\CorrespondingAuthor}[2]{{#1}\footnote{Corresponding author: #2}}
\newcommand{\PresentingAuthor}[1]{\underline{#1}}
\newcounter{Address}
\newcommand{\Address}[2]{\refstepcounter{Address}{\footnotesize\itshape \theAddress.\ #2 \label{#1}\\}}
\newcommand{\AddressLabel}[1]{$^{#1}$}
\newcounter{Reference}
\newcommand{\Reference}[2]{\refstepcounter{Reference} {[\theReference] #2 \label{#1}}}
\newcommand{\References}{\setlength\parindent{0pt}\vspace{2ex}\textbf{References}\footnotesize}
\newcommand{\AbstractCite}[1]{[\ref{#1}]}
\newcounter{AbstractFigure}
\newcommand{\AbstractFigure}[2]{\refstepcounter{AbstractFigure} \begin{center}#1\\ \vspace{1ex} \noindent\parbox{0.8\textwidth}{\footnotesize \textbf{Fig.\ \theAbstractFigure:} #2}\end{center}}
\newcounter{AbstractTable}
\newcommand{\AbstractTable}[2]{\refstepcounter{AbstractTable} \begin{center}\noindent\parbox{0.8\textwidth}{\footnotesize \textbf{Table \theAbstractFigure:} #2} \vspace{1ex}\\#1\end{center}}
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%  The following can be edited to compose your abstract. 
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\begin{document}

\begin{center}
\AbstractTitle{Title}

\AbstractAuthors{
	\CorrespondingAuthor{\PresentingAuthor{A. Author}}{a.email@email.com}\AddressLabel{\ref{firstaddress},\ref{secondaddress}}{A.Nother-Author}\AddressLabel{\ref{secondaddress}}}

\Address{firstaddress}{Institute address}

\Address{secondaddress}{A second Institute address}

\vspace{3ex}
\end{center}
%


\end{document}
