I have ankylosing spondylitis and my vitamin D level is 7.36ng/ml. Is it a serious issue? What should I do? - Quora
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Calcium physiology, metabolism and supplementation: a glance at patients with ankylosing spondylitis
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Vitamin D level in ankylosing spondylitis male patients: A potential association with the functional status and platelet count - ScienceDirect
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