¿Cómo modificar este código para escribir afiliación de los autores?

Question

He creado con éxito un documento de resúmenes para próximas conferencias basado en este código que está disponibleaquípero ¿alguien podría decirme qué debo modificar para producir la afiliación de los autores? Muchas gracias.

\documentclass[11pt,a4paper]{article}

\usepackage[ngerman]{babel}
\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{blindtext}

\setlength{\parindent}{0cm} % Default is 15pt.

\usepackage[titles]{tocloft}

\newcommand{\listabstractname}{List of Abstracts}
\newlistof[section]{abstracts}{abs}{\listabstractname}

\newenvironment{abstracts}[1]{%
\refstepcounter{abstracts}%
\small%
\begin{center}%
  \textbf{#1}%
\end{center}%
\quotation%
\addcontentsline{abs}{abstracts}{#1}%
}{%
\endquotation%
\clearpage%
}

\newcommand\abstractauthor[1]{\authortoabs{#1}\printabstractauthor{#1}}

\newcommand{\printabstractauthor}[1]{%
{\noindent\centering\scshape#1\par\nobreak\vspace*{35pt}}%
}
\newcommand{\authortoabs}[1]{%
  \addtocontents{abs}{\vskip-10pt}%
  \addtocontents{abs}{%
    \protect\contentsline{section}{\hskip1.3em\mdseries\scshape\protect\scriptsize#1}{}{}}%
  \addtocontents{abs}{\vskip5pt}%
}

\begin{document}

\listofabstracts
\clearpage

\begin{abstracts}{This is a test title of an abstract}
\abstractauthor{First Author, Second Author}
\blindtext[3]
\end{abstracts}

\begin{abstracts}{This is a second abstract}
\abstractauthor{First Author}
\blindtext[3]
\end{abstracts}

\end{document} 

Answer 1

Pruebe este sencillo enfoque.

% !TeX TS-program = pdflatex

\documentclass[11pt,a4paper]{article}

\usepackage[ngerman]{babel}
\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{blindtext}

\setlength{\parindent}{0cm} % Default is 15pt.

\usepackage[titles]{tocloft}

\newcommand{\listabstractname}{List of Abstracts}
\newlistof[section]{abstracts}{abs}{\listabstractname}

%%************************************ added <<<<<<<<<<<<
\newcounter{authornum}
\newcommand{\TA}{\stepcounter{authornum}\textsuperscript{\theauthornum}}

\newcounter{affilnum}
\newcommand{\TF}{\stepcounter{affilnum}\textsuperscript{\theaffilnum}}

\newcommand{\afillauthor}[1]{\par\medskip\noindent\hfill\TF#1\hfill}

\newcommand{\printabstract}[1]{\par\vspace*{2em}#1}
%%************************************

\newenvironment{abstracts}[1]{%
    \refstepcounter{abstracts}%
    \setcounter{authornum}{0}\setcounter{affilnum}{0}% added <<<<<<<<<<<<   
    \small%
    \begin{center}%
        \textbf{#1}%
    \end{center}%
    \quotation% 
    \addtocontents{abs}{\vskip2ex}% added <<<<<<<<<<<<  
    \addcontentsline{abs}{abstracts}{#1}%
}{%
    \endquotation%
    \clearpage%
}

\newcommand{\printabstractauthor}[1]{% changed <<<<<<<<<<<<
    {\noindent\hfill\scshape#1\TA\hfill}
}%

\newcommand{\addauthortoToC}[1]{% added <<<<<<<<<<<<
    \par\addtocontents{abs}{%
        \protect\contentsline{section}{\vskip-1.7\baselineskip\hskip1.3em\mdseries\scshape\protect\scriptsize#1}{}{}}%
}


\begin{document}
    
    \listofabstracts
    \clearpage

    \begin{abstracts}{This is a test title of an abstract}
        \printabstractauthor{First Author}
        \printabstractauthor{Second Author}
        \addauthortoToC{First Author, Second Author}
        \afillauthor{University One}
        \afillauthor{University Two}
        \printabstract{\blindtext[3]}
    \end{abstracts}
    
    \begin{abstracts}{This is a second abstract}
        \printabstractauthor{First Author}
        \addauthortoToC{First Author}
        \afillauthor{University Three}
        \printabstract{\blindtext[3]}
    \end{abstracts}
    
    \begin{abstracts}{This is a third abstract}
        \printabstractauthor{First Author}
        \printabstractauthor{Second Author}
        \printabstractauthor{Third Author}
        \addauthortoToC{First Author, Second Author, Third Author}
        \afillauthor{University One}
        \afillauthor{University Two}
        \afillauthor{University Three}
        \printabstract{\blindtext[3]}
    \end{abstracts}
    
\end{document}