In the elsarticle template, I am not able to use the command \underbrace, whereas, in a simple latex file, the command is working fine. Following is the code:
\documentclass[review,12pt,3p,times]{elsarticle}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{color}
\usepackage{esint}
\begin{document}
\begin{equation}
E_i=\underbrace{\left(H_1+H_2 S_h +H_3 \left(\frac{T-T_0}{T_0}\right)\right)}_{\text{H}}
\end{equation}
\end{document}


