Displaying "Supplementary References" instead of a line as a title of a REVTeX bibliography

REVTeX (4 and 4-1) separates the bibliography from the rest of the paper with a horizontal line. I am wondering how I can replace that line with “Supplementary References” in the section heading font/format. Here my MWE:

documentclass[onecolumn,noshowpacs,noshowkeys,pra]{revtex4-1}
begin{document}

section{Blah}
Blah blah blah
section{More blah}
Blah blah blah blah

begin{thebibliography}{99}
bibitem{sample1} This is a sample bibitem
bibitem{sample2} This is another sample bibitem
end{thebibliography}
end{document}

It produces this:

I want to replace the horizontal line with “SUPPLEMENTARY REFERENCES” (so that it looks like section titles (“I. BLAH” and “II. MORE BLAH”).

UPDATE

After playing around a bit with this, I found that putting a section* command inside thebibliography environment is allowed! Thus, this code:

documentclass[onecolumn,noshowpacs,noshowkeys,pra]{revtex4-1}
begin{document}

section{Blah}
Blah blah blah
section{More blah}
Blah blah blah blah

begin{thebibliography}{99}
section*{SUPPLEMENTARY REFERENCES}
bibitem{sample1} This is a sample bibitem
bibitem{sample2} This is another sample bibitem
end{thebibliography}
end{document}

produces this:

This sort of works for now. However, I would really like to be able to remove the line. Also, it would be nice to (painlessly) automate the process. I use BibTeX to create the *.bbl file automatically. While I suppose that I could write code (say, in python) that would run after every time I compile the bibliography with BibTeX and insert the line containing section* command into the .bbl file, there must be a less kludgy way out there… right?

defbibsection{}  
% This will remove the section title, so the line will be removed

centerline{ textbf{large  Supplementary References } }
% Add the reference section title as: Supplementary References
% You can put it in another style you need

bigbreak
% create some space