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Global urban and rural population growth in developed and underdeveloped areas from 1950 to 2050.11 Reprinted from Lancet Infect Dis, 11, Alirol E, Getaz L, Stoll B, Chappuis F, Loutan L, Urbanisation and infectious diseases in a globalised world, 131–241, Copyright 2012, with permission from Elsevier
