title: A study on lacrimal insufficiency.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004558:Electric Stimulation; D005152:Facial Muscles / Q000502:physiology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D007765:Lacrimal Apparatus / Q000502:physiology* / Q000503:physiopathology; D007766:Lacrimal Apparatus Diseases / Q000209:etiology* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D009119:Muscle Contraction; D013666:Tears / Q000378:metabolism