Serum retinol levels in liver and gastrointestinal diseases.
D000328:Adult; D005260:Female; D005767:Gastrointestinal Diseases / Q000378:metabolism*; D006801:Humans; D008107:Liver Diseases / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D014801:Vitamin A / Q000097:blood*
D014801:Vitamin A