| http://www.w3.org/ns/prov#value | - The three-month study recruited patients from among the 50 -65 age group undergoing routine colorectal cancer screening to complete questionnaires regarding vaccination, exposure, previous history of Hepatitis A or Hepatitis B or Hepatitis C. The patients were asked to disclose any risk factors including high risk sexual activity, injection drug use, tattoos placed before 2000, HIV status or hemop
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