The study involved 600 men--399 with syphilis and 201 who did not have the disease. Researchers told the men they were being treated for "bad blood", a local term used to describe several ailments, including syphilis, anemia, and fatigue. In truth, they did not receive the proper treatment needed to cure their illness. In exchange for taking part in the study, the men received free medical exams, free meals, and burial insurance. Although originally projected to last 6 months, the study actually went on for 40 years. Which of the following choices would be an acceptable paraphrase of the information?