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Wigfall L, Duffus WA, Annang L, Richter DL, Torres ME, Williams EM, Glover SH.Wigfall L, et al. Among authors: richter dl.J S C Med Assoc. 2009 Dec;105(7):274-80.J S C Med Assoc. 2009.PMID: 20108718Free PMC article.
Sy FS, Timbo BB, Addy CL, Richter DL, Macera CA, Pozsik CJ.Sy FS, et al. Among authors: richter dl.J S C Med Assoc. 1993 Feb;89(2):71-6.J S C Med Assoc. 1993.PMID: 8445881