"Clalit" Health Services;
Children’s Health Center;
the Center for Evaluation of Health Promotion Interventions;
School of Public Health;
Haifa University;
Faculty of Medicine;
Technion;
Israel Institute of Technology;
Department of Medicine;
Mc Gill University Health Center;
Mc Gill University;
Center for Bone and Periodontal Research;
McG ill University;
Vitamin; D; Deficiency; Children; Obesity; Bone; metabolism; Muscle; strength; Osteoporosis; Nonskeletal; diseases;