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Do breathing exercises really work? UK doctors on how to protect against coronavirus – and manage symptoms | Health & wellbeing | The Guardian
Vitamin D Helps Kids' Breathing, Study Says: Are Supplements Smart? - CBS News
Vitamin D deficiency is associated with respiratory symptoms and airway wall thickening in smokers with and without COPD: a prospective cohort study | BMC Pulmonary Medicine | Full Text
Can Vitamin D Lower the Risk of Respiratory Infections?
Is Breathing Trouble a Symptom of a Vitamin D Deficiency? | livestrong
Vitamin D is Vital to Maintaining Healthy Lungs and Respiratory System Function - GrassrootsHealth
Vitamin D May Be Linked to COPD; Associated with Respiratory Function