title: Two cases of magnesium deficiency of unknown etiology.
mesh_terms: D000328:Adult; D000367:Age Factors; D002979:Climacteric; D005260:Female; D006801:Humans; D008275:Magnesium Deficiency / Q000209:etiology*; D008599:Menstruation Disturbances / Q000175:diagnosis; D008875:Middle Aged