Ics 2009;35:20. 15. Sparks JW. Human intrauterine growth and nutrient accretion. Semin Perinatol 1984;8:74-93. 16. Harrison CM, Johnson K, McKechnie E. Osteopenia of prematurity: a national survey and overview of practice. Acta Pediatr 2008;97:407-13. 17. Schultheis L. The mechanical manage method of bone in weightless spaceflight and in aging. Exp Gerontol 1991;26:203-14. 18. Mazess RB, Whedon GD. Immobilization and bone. Calcif Tissue Int 1983;35:265-7. 19. Yeh JK, Liu CC, Aloia JF. Effects of exercising and immobilization on bone formation and resorption in young rats. Am J Physiol 1993;264:E182-9. 20. Rodriguez JI, et al. Adjustments within the extended bones as a consequence of fetal immobility brought on by neuromuscular illness. A NPY Y2 receptor Antagonist Compound radiographic and histological study. J Bone Joint Surg Am 1988;70:1052-60. 21. Eliakim A, et al. Spontaneous activity in β adrenergic receptor Modulator web premature infants affects bone strength. J Perinatol 2002;22:650-2. 22. Moyer-Mileur L, et al. Effect of physical activity on bone mineralization in premature infants. J Pediatr 1995;127:620-5. 23. Zanardo V, et al. Methylxanthines enhance renal calcium excretion in preterm infants. Biol Neonate 1995;68:169-74. 24. Colwell A, Eastell R. The renal clearance of free and conjugated pyridinium cross-links of collagen. J Bone Miner Res 1996;11:1976-80. 25. Ng Pc, et al. Adjustments in markers of bone metabolism throughout dexamethasone therapy for chronic lung disease in preterm infants. Arch Dis Kid Fetal Neonatal Ed 2002;86:F49-54. 26. Eliakim A, et al. The impact of neonatal sepsis on bone turnover in very-low birth weight premature infants. J Pediatr Endocrinol Metab 2003;16:4138. 27. Guzm JM, et al. Parenteral nutrition and immature neonates. Comparative study of neonates weighing below 1000 and 1000-1250 g at birth. Early Hum Dev 2001;65:S133-44. 28. Von Sydow G. A study on the development of rickets in premature infants. Acta Paediatr Scand 1946;33:S3-S122. 29. Koo WWK, et al. Skeletal alterations in preterm infants. Arch Dis Youngster 1982;57:447-452. 30. Mazess RB, et al. Does bone measurement on the radius indicate skeletal status Concise communication. J Nucl Med 1984;25:281-89. 31. Greer FR, et al. An correct and reproducible absorptiometric technique for determining bone mineral content in newborn infants. Pediatr Res 1983;17:259-62. 32. Koo WW, et al. Sequential bone mineral content in tiny preterm infants with and devoid of fractures and rickets. J Bone Miner 1988;Res 3:193-7. 33. Syed Z, Khan A. Bone densitometry: applications and limitations. J Obstet Gynaecol Can 2002;24:476-84. 34. Fewtrell MS, British Paediatric Adolescent Bone Group. Bone densitometry in children assessed by dual x ray absorptiometry: uses and pitfalls. Arch Dis Kid 2003;88:795-8. 35. Katzman DK, et al. Clinical and anthropometric correlates of bone mineral acquisition in wholesome adolescent girls. J Clin Endocrinol Metab 1991;73:1332-9. 36. Gluer CC, et al. 3 quantitative ultrasound parameters reflect bone structure. Calcif Tissue Int 1994;55:46-52. 37. Njeh CF, et al. An in vitro investigation from the dependence on sample thickness on the speed of sound along the specimen. Med Eng Phys 1999;21:651-9. 38. Bouxsein ML, Coan BS, Lee SC. Prediction of the strength in the elderly proximal femur by bone mineral density and quantitative ultrasound measurements from the heel and tibia. Bone 1999;25:49-54. 39. Rubinacci A, et al. Quantitative ultrasound for the assessment of osteopenia in preterm infants. Eur J Endocrinol 2003;149:307-15. 40. Nem.