Child opinions related to a core outcome set for school-based healthy lifestyle behavior interventions: the COCOS study - Altenburg, Teatske M.; de Vries, Lotte W.; Barbeau, Kheana; Button, Alyssa; Cox, Ashley; Lannoy, Louise de; MacDonald, Mhairi; Naidoo, Rowena; Staiano, Amanda E.; Tremblay, Mark S.; Harrington, Deirdre M. (Frontiers in Public Health, 2025)