ECE	Early Childhood Education
EPHPP	Effective Public Health Practice Project
ERIC	Education Research Information Centre
PI(E)COS	Population, Intervention or Exposure, Comparison, Outcomes and Study design
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
RCT	Randomised controlled trial
SES	Socioeconomic status
SWiM	Synthesis Without Meta-analysis
GRADE	Grading of Recommendations Assessment, Development and Evaluation