Changing carriage rate of Neisseria meningitidis among university students during the first week of term: cross sectional study. - Neal, Keith R.; Nguyen-Van-Tam, Jonathan S.; Jeffrey, Nicholas; Madeley, Richard J.; Job, Katy; Slack, Richard C.; Ait-Tahar, Kamel; Ala'Aldeen, Dlawer A. A.; Wale, Martin C. J. (BMJ: British Medical Journal (International Edition), 2000)