\documentclass[11pt, a4paper]{article}
\usepackage{helvet} \renewcommand{\familydefault}{\sfdefault}
\usepackage[margin=2.5cm, head=1.27cm]{geometry}
\usepackage{xcolor}
\usepackage{fancyhdr}
\pagestyle{fancy}
\lhead{}
\chead{\textcolor{gray}{Population-based Time-to-event Analyses International Conference 2016}}
\rhead{}
\renewcommand{\headrulewidth}{0pt}
%
\lfoot{}
\cfoot{UK PTA, London, 31 August--2 September 2016}
\rfoot{}
%
\parindent 0pt
%%%
\begin{document}
%
%Please leave text above unchanged
%Replace below with your information
\begin{center}
\textbf{THE TITLE OF YOUR ABSTRACT GOES HERE}\\[1em]
FIRST AUTHOR NAME GOES HERE$^1$, SECOND AUTHOR NAME$^2$ and THIRD AUTHOR NAME$^1$\\[1em]
\end{center}
$^1$ AFFILIATION 1\\
$^2$ AFFILIATION 2\\

TYPE YOUR 300-WORD ABSTRACT HERE


\end{document}