A high participation rate in anonymous HIV surveillance resulted from frank discussion with prisoners, use of saliva samples, and, for study purposes, self completion questionnaires * The proportion of injecting drug users differed according to residence before prison: 41% of Glasgow residents, 21% of Edinburgh residents, and 11% of those resident else- where * A quarter of injecting drug users in Glenochil prison had started injecting while in some prison * Between a quarter and a third of men who
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Rossing et al. (1995) studied this question.
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