Potterat, J. J., Brody, S., Brewer, D. D., & Muth, S. Q. (2008). Assessing anal intercourse and blood exposures as routes of HIV transmission in Mombasa, Kenya. Sexually Transmitted Infections, http://sti.bmj.com/cgi/eletters/sti.2007.028852v1.

letter (ISR site)

letter (journal site)