\usepackage[normalem]{ulem}
\sout{}
sout in the section (a)\usepackage{ulem}
\usepackage{hyperref}
\usepackage{nameref}
\DeclareRobustCommand{\hsout}[1]{\texorpdfstring{\sout{#1}}{#1}}
\section{\hsout{Striked out section title}}\label{foo}\sout{\mbox{\cite{a,b}}}