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\documentclass{article}
\usepackage{amssymb,amsmath,amsthm}
\usepackage{enumerate}
\linespread{1.6}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{definition}{Definition}[section]
\newtheorem{corollary}{Corollary}[section]
\newtheorem{proposition}{Proposition}[section]
\newtheorem{case}{Case}
\usepackage{apacite}
\usepackage{natbib}
\title{Question}
\author{John Doe\footnote{I would like to thank you all. Address: P.O. Box 1000, Amsterdam, 1000 Dxy, The Netherlands. E-mail: abc@gmail.com, tel: (+31) 123456.} \\ \small My Institute}
\date{\small{\today}}
\begin{document}
\maketitle
\begin{abstract}
some abstract here
\end{abstract}
\end{document}