Avoiding the under-diagnosis of low bone mineral density in Egyptian children with chronic medical conditions affecting bone health 24. Arikoski P, Voutilainen R, Kroger H. Bone mineral density in long-term survivors of childhood cancer. J Pediatr Endocrinol Metab 2003; 16: 343-53. 25. Ruiz JC, Mandel C, Garabedian M. Influence of sponta- neous calcium intake and physical exercise on the vertebral and femoral bone mineral density of children and adolescent. J Bone Miner Res 1995; 1: 675-81. 26. ElBaky AA, Ismail NA, Salama E, Abou-Zekri M, Fatouh A, Ragab S. Inappropriate restriction of dietary gluten and associated bone and bone density in Egyptian Children with celiac disease. Arch Med Sci 2009; 5: 589-95. 27. Koura HM, El-Katoury A, Abdallah NI, El-Bassyouni HT, Ayoub DF, Bassioun RI. Bone mineral density in Egyptian children with Mucopolysaccharidoses. Res J Med Sci 2009; 4: 100-6. 28. Binkovitz LA, Henwood MJ, Sparke P. Pediatric dual-energy X-ray absorptiometry: technique, interpretation, and clinical applications. Semin Nucl Med 2007; 37: 303-13. 29. Saywer AJ, Bachrach LK, Fung EB. Bone densitometry in growing patients. Guidelines for clinical practice. Totowa, NJ: Humana Press 2007. Arch Med Sci 4, August / 2011 705