ESTIMATING THE RATE OF ACQUIRING IMMUNITY TO SEVERE DISEASE DUE TO PLASMODIUM FALCIPARUM WITH AGE AND EXPOSURE - Hollingsworth, D; Ferguson, N; Griffin, J; Donnelly, C; Drakeley, C; Riley, E; Reyburn, H; Ghani, A (AMER SOC TROP MED & HYGIENE, 2009)