Tongue colour and B-vitamin deficiencies.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002196:Capillaries; D003116:Color; D003490:Cyanosis / Q000150:complications / Q000209:etiology; D006801:Humans; D008875:Middle Aged; D014059:Tongue / Q000098:blood supply; D014804:Vitamin B Deficiency / Q000150:complications*