Columbia subject headings:
Gastrointestinal system--Biopsy.
Gastrointestinal system--Diseases--Atlases.
Histology, Pathological--Atlases.
Harvard subject headings:
Gastrointestinal system--Biopsy
Gastrointestinal system--Diseases--Atlases.
Histology, Pathological--Atlases
Princeton subject headings: