Abstract
School of Medicine, Health Policy and Practice, University of East Anglia, Norwich NR4 7TJ, UK Department of Microbiology, Lister Hospital, East and North Hertfordshire NHS Trust, Stevenage, UK Department of Medicine, Lister Hospital East and North Hertfordshire NHS Trust, Stevenage, UK East and North Hertfordshire Health Protection Unit, Health Protection Agency, Welwyn Garden City, UK North Hertfordshire and Stevenage Primary Care Trust, Letchworth, UK
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