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Natasha L Tilston*, Ken TD Eames*, Daniela Paolotti, Toby Ealden and W John Edmunds*
* Corresponding authors: Natasha L Tilston natasha.tilston@gmail.com - Ken TD Eames ken.eames@lshtm.ac.uk - W John Edmunds john.edmunds@lshtm.ac.uk
BMC Public Health 2010, 10:650 doi:10.1186/1471-2458-10-650