Figure 3From: A birth cohort study of viral infections in Vietnamese infants and children: study design, methods and characteristics of the cohort Flowchart of cohort participants screened, enrolled and followed up between 1 July 2009 (the commencement of enrolment) and 31 August 2011. Brackets show the numbers by study site (Ho Chi Minh City; Dong Thap).Back to article page