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@article{Hopewell_2008,  doi = {10.1016/s0140-6736(07)61835-2},  url = {http://dx.doi.org/10.1016/S0140-6736(07)61835-2}, {http://dx.doi.org/10.1016/s0140-6736(07)61835-2},  year = {2008},  month = {jan},  publisher = {Elsevier {BV}},