Sources of variability in the measurement of Ascaris lumbricoides infection intensity by Kato-Katz and qPCR - Easton, AV; Oliveira, RG; Walker, M; O'Connell, EM; Njenga, SM; Mwandawiro, CS; Webster, JP; Nutman, TB; Anderson, RM (Parasites & Vectors, 2017)