如何避免/删除第一作者上标中不需要的逗号，如 NikM^{,a}

Question

我正在使用elsarticleclass 并获取，NikM^{,a}。因此，前面的逗号a是不需要的。我想将其删除。

\author[1]{NikM%
\fnref{fn1}}
\ead{[email protected]}

\author[2]{Ni}
\ead{[email protected]}

\author[1]{Vj\corref{3}}
\cormark[3]
\ead{[email protected]}

\author[2]{V. Vis}
%[orcid=]
\ead{[email protected]}

\cortext[3]{VJ}
\fntext[fn1]{NikM}
\tnotetext[t1]{This document is the results of the research
project funded by the National Science Foundation.}

\affiliation[1]{organization={Central University of Rajasthan}, 
            city={Ajmer},
            postcode={305817}, 
            state={Rajasthan},
            country={India}
            }
\affiliation[2]{organization= {Russian Academy of Sciences},
            %addressline=, 
            city={Moscow},
            postcode= {117997}, 
           % state=,
            country={Russia}
            }