EFFECTIVENESS OF NUTRITIONAL IMPROVEMENT AMONG CHILDREN WITH PICKY EATING THROUGH THE USE OF CALOKID GOLD IN SOME PRESCHOOLS IN NORTHERN MIDLAND AND MOUNTAINOUS REGION. YHCĐ [Internet]. 2026 Mar. 31 [cited 2026 Sept. 8];67(3). Available from: https://tapchiyhcd.vn/index.php/yhcd/article/view/4606