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b'LONDON\\u2014Part of the success of the Global Alliance for Vaccines and Immunisation (GAVI) talks held in London may have been the availability of new ways of funding vaccines to guarantee their affordability in low and middle-income countries. Dr James Hargreaves of the London School of Hygiene & Tropical Medicine tells Sarah Maxwell about \\u201cpush\\u201d and \\u201cpull\\u201d techniques his group has been looking at to get the biggest \\u201cbang for the buck\\u201d in vaccine provision for the developing world.'