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fruit vegetable intake children intervention vegetable intake school study parent determinant effect country group health level schoolchildren netherland children intervention fruit intake analyses school curriculum implementation frequency vegetable consumption change norway questionnaire follow-up difference baseline consumption intake levels activity project availability spain involvement curriculum european control result chapter dutch intervention group control group factor sample behaviour preference table knowledge model klepp teacher research association influence measure child programme development children project mother appreciation family question increase evaluation intervention schools european countries nutrition intervention mapping protocol process portion objective correlate regression validity review gender