Latex Elsevier template page number on both top and bottom

Question

In Elsevier template, there is a problem. It creates page number on both top right and bottom of the page. How should I remove the page number on the bottom?

\documentclass[3p,times,twocolumn,authoryear]{elsarticle}

\usepackage{ecrc}
\volume{00}

\firstpage{1}

\journal{Expert Systems with Applications}

\runauth{Me et al.}

%% The choice of journal logo is determined by the \jid and \jnltitlelogo commands.
%% A user-supplied logo with the name <\jid>logo.pdf will be inserted if present.
%% e.g. if \jid{yspmi} the system will look for a file yspmilogo.pdf
%% Otherwise the content of \jnltitlelogo will be set between horizontal lines as a default logo

%% Give the abbreviation of the Journal.
\jid{eswa}

%% Give a short journal name for the dummy logo (if needed)

%\jnltitlelogo{images/logo/logo-expert-systems-with-applications.gif}
\jnltitlelogo{Expert Systems with Applications}

%% Hereafter the template follows `elsarticle'.
%% For more details see the existing template files elsarticle-template-harv.tex and elsarticle-template-num.tex.



\usepackage{amssymb}
\usepackage[figuresright]{rotating}


\usepackage{lipsum}

\usepackage{etoolbox}
\AtBeginDocument{%
  % \patchcmd{<cmd>}{<search>}{<replace>}{<success>}{<failure>}
  \patchcmd{\MaketitleBox}{\vspace*{-20pt}\fi}{\fi}{}{}%
}

\begin{document}

\begin{frontmatter}

\dochead{}

\title{title title title title title title }

\author{author1}
\author{author2}
\author{author3}
\address{address1}
\address{address2}

\begin{abstract}
\lipsum[75]
\end{abstract}

\begin{keyword}
key1,key2,key3,key4,key5,key6
\end{keyword}

\end{frontmatter}

\section{first section}

\lipsum[3-10]


\bibliographystyle{elsarticle-num-names}
\bibliography{optimizing_horizon_ref}


\end{document}