A. J. Billington

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OBJECTIVE To determine the effectiveness of a brief cognitive behavioural intervention in reducing the incidence of sexually transmitted infections among gay men. DESIGN Randomised controlled trial with 12 months' follow up. SETTING Sexual health clinic in London. PARTICIPANTS 343 gay men with an acute sexually transmitted infection or who reported(More)
The abstraction, treatment and supply of potable (drinking) water presents a range of special problems. Early attempts at introducing and extending the range of automatic control at a water treatment plant were invariably compromised by the poor quality of the instrumentation available. Improved sensor technology and the advent of microprocessor based(More)
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