Hypovitaminosis D is one of the principal risk factors for osteoporosis. Some studies estimated that more of 40% of Italian women over sixty are osteoporotic. Osteoporotic fracture is a significant cause of morbidity and cost. https://www.roneverhart.com/Western-Digital-Ultrastar-DC-HC550-WUH721816ALE6L0-0F38460-16TB-7-2K-RPM-SATA-6Gb-s-512e-ISE-3-5in-Hard-Drive/