What does S-F stand for?

MLA style: "S-F." Acronym Finder . 2013. AcronymFinder.com 20 May. 2013 http://www.acronymfinder.com/symphysis-to-fundus-(S_F).html
Chicago style: Acronym Finder . S.v. "S-F." Retrieved May 20 2013 from http://www.acronymfinder.com/symphysis-to-fundus-(S_F).html
APA style: S-F. (n.d.) Acronym Finder. (2013). Retrieved May 20 2013 from http://www.acronymfinder.com/symphysis-to-fundus-(S_F).html

symphysis to fundus

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