按我粗略的看如下的切片:
% \renewcommand\thefootnote{}
% \footnotetext{\textbf{Abbreviations:} ANA, anti-nuclear antibodies; APC, antigen-presenting cells; IRF, interferon regulatory factor.}
% \renewcommand\thefootnote{\fnsymbol{footnote}}
% \setcounter{footnote}{1}
你所指的横线应该是\footnoterule
导致的,使用下面的代码即可去掉:
\renewcommand{\footnoterule}{}