Columbia subject headings:
Carcinogens--Metabolism--Congresses.
Gastrointestinal system--Cancer--Etiology--Congresses.
Xenobiotics--Metabolism--Congresses.
Harvard subject headings:
Carcinogens--Metabolism--Congresses.
Gastrointestinal system--Cancer--Etiology--Congresses.
Xenobiotics--Metabolism--Congresses.
Princeton subject headings: