https://www.taylorfrancis.com/chapters/edit/10.4324/9780429344732-6/physical-activity-surveillance-context-low-middle-income-countries-%C5%BEeljko-pedi%C5%A1i%C4%87-cora-craig-adrian-bauman?context=ubx&refId=7c3c420d-0e7c-4f40-ac9e-e2cf90f470fb