Science
Vol.323, No.5919, 6 March 2009
The New England Journal of Medicine
Vol.360, No.11, March 12 2009
Sexually Transmitted Diseases
Vol.36, No.3, March 2009
Vol.36, No.3, Supplement
The International Journal of Tuberculosis and Lung Disease
Vol.13, No.3, March 2009
Abstracts on Hygiene and Communicable Disease
Vol.84, No.3, March 2009
Nature
Vol.458, No.7235, 12 March 2009
Epidemiology & Infection
Vol.137, Issue 4, April 2009
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