Table 2.

Inclusion steps

Inclusion criteria	Exclusion criteria
Stage 1 – Titles      • Primary data OR methods from a birth cohort study / child longitudinal study (including cross-sectional data)      • Meta-analysis of several birth cohort / child longitudinal studies	Stage 1      • Not from a developing country (12)
Stage 2 – Abstracts and Full Papers      • Country in WHO South East Asian or Eastern Mediterranean regions.	Stage 2      • Start age <60 mo.