Columbia subject headings:
Drugs--Prices--Canada.
Drugs--Prices--Mexico.
Drugs--Prices--United States.
Prescription pricing--United States.
Harvard subject headings:
Drugs--Prices--Canada.
Drugs--Prices--Mexico.
Drugs--Prices--United States.
Pharmaceutical industry--Prices--United States.
Prescription pricing--United States
Princeton subject headings:
Drugs--Prices--Canada.
Drugs--Prices--Mexico.
Drugs--Prices--United States.
Prescription pricing--United States.