Methods and challenges in measuring the impact of national pneumococcal and rotavirus vaccine introduction on morbidity and mortality in Malawi.

Bar-Zeev N, Kapanda L, King C, Beard J, Phiri T, Mvula H, Crampin AC, Mwansambo C, Costello A, Parashar U, Tate JE, Verani JR, Whitney CG, Heyderman RS, Cunliffe NA, French N, VacSurv Consortium,