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  1. Vitamin D Deficiency: Causes, Symptoms & Treatment - Cleveland Clinic

  2. Vitamin D for the Prevention of Disease | Endocrine Society

  3. Vitamin D Deficiency > Fact Sheets - Yale Medicine

  4. Vitamin D Deficiency: Causes, Symptoms & Health Risks - WebMD

  5. Vitamin D - Mayo Clinic

  6. Vitamin D Deficiency: Symptoms, Causes, and Treatment

  7. Vitamin D deficiency in adults: Definition, clinical ... - UpToDate

  8. Vitamin D deficiency - Symptoms, diagnosis and treatment

  9. Vitamin D Dosing: Basic Principles and a Brief Algorithm (2021 …

  10. Vitamin D Deficiency and Related Disorders Treatment