Effect of a Web-Based Nutritional and Physical Activity Intervention With Email Support (the EDDY Program) on Primary School Children's BMI Z-Score During the COVID-19 Pandemic: Intervention Study

一项基于网络并辅以电子邮件支持的营养和体育活动干预项目（EDDY项目）对新冠疫情期间小学生BMI Z评分的影响：干预研究