De Bock, Freia A participatory parent-focused intervention promoting physical activity in preschools: design of a cluster-randomized trial. [electronic resource] - BMC public health Jan 2010 - 49 p. digital Publication Type: Journal Article; Randomized Controlled Trial ISSN: 1471-2458 Standard No.: 10.1186/1471-2458-10-49 doi Subjects--Topical Terms: Child, PreschoolExerciseGermanyHealth Promotion--methodsHumansParent-Child RelationsResearch DesignSchools, Nursery