title: Skeletal muscle and chornic vitamin deficiency.
mesh_terms: D002908:Chronic Disease; D006801:Humans; D009132:Muscles / Q000502:physiology*; D013035:Spasm / Q000209:etiology*; D014802:Vitamin A Deficiency / Q000150:complications*; D014808:Vitamin D Deficiency / Q000150:complications*