Columbia subject headings:
Chymopapain--Therapeutic use.
Collagenases--Therapeutic use.
Injections, Intradiscal.
Intervertebral disk--Hernia--Chemotherapy.
Harvard subject headings:
Chemonucleolysis
Chymopapain--Therapeutic use.
Collagenases--Therapeutic use.
Injections, Intradiscal
Intervertebral disk--Hernia--Chemotherapy.
Princeton subject headings: