| http://www.w3.org/ns/prov#value | - J Natl Cancer Inst 1989 Nov 15;81(22):1726-31 Abstract quote We conducted a study of 126 patients with anal and rectal squamous cell carcinoma and 372 randomly selected control subjects in the San Francisco Bay Area (CA) to test the hypothesis that these tumors are related to a history of anal intercourse, the presence of sexually transmitted diseases and other conditions of the anal area, treatme
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