5Ryan S. Nutritional aspects of metabolic bone disease in the newborn [J] . Arch Dis Child Fetal Neonatal Ed, 1996,74 (2) :F145-148.
6Rigo J, De Curtis M, Pieltain C, et al. Bone mineral metabolism in the micropremie [J]. Clin Perinatol,2000, 27( 1 ) : 147-170.
7Jones G, Dwyer T. Bone mass in prepubertal children:gender differences and the role of physical activity and sunlight exposure [J]. J Clin Endocrinol Metab, 1998,83 (12) : 4274-4279.
8Lehtonen-Veromaa M, Mottonen T, Irjala K, et al. A 1- year prospective study on the relationship between physical activity,markers of bone metabolism,and bone acquisition in peripubertal girls [J]. J Clin Endocrinol Metab,2000,85 (10) :3726-3732.
9Specker B, Binkley T. Randomized trial of physical activity and calcium supplementation on bone mineral content in 3-to 5-year-old children [J]. J Bone Miner Res,2003, 18(5) :885-892.