| http://www.w3.org/ns/prov#value | - Although recommendations have been made by vitamin D experts that every American of any age should get a yearly 25-hydroxyvitamin D level, people with osteopenia, osteoporosis, an oophorectomy, kidney impairment (with serum creatinine of 1.5 mg. or higher), cancer, coronary bypass surgery, autoimmune diseases especially including multiple sclerosis, are at particular need to get a level and treat
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