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  1. Vitamin D Deficiency: Causes, Symptoms & Treatment

  2. Vitamin D Deficiency: Symptoms, Treatments, and Causes

  3. 14 Signs of Vitamin D Deficiency: 12 Causes & Treatment

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

  5. Vitamin D deficiency - Mayo Clinic

  6. Vitamin D Deficiency > Fact Sheets - Yale Medicine

  7. Vitamin D Deficiency: Symptoms, Causes And Treatments

  8. Symptoms of Vitamin D Deficiency (Children and Adults)

  9. Vitamin D deficiency - Symptoms, diagnosis and treatment

  10. Vitamin D - Mayo Clinic