> how these studies control for confounding factors like that The answer is: they simply do not at all. [1] http://www.salem-news.com/fms/pdf/2011-12_JLM-Boyl

> how these studies control for confounding factors like that The answer is: they simply do not at all. [1] http://www.salem-news.com/fms/pdf/2011-12_JLM-Boyle-Hill.pdf http://www.salem-news.com/fms/pdf/2011-12_JLM-Boyle-Hill.pdf [2] http://www.circumstitions.com/HIV-SA.html http://www.circumstitions.com/HIV-SA.html