Drug patent protection: how long is long enough?
Sibbald
B
B
D002170:Canada; D016527:Drug Costs / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data; D004345:Drug Industry / Q000191:economics / Q000331:legislation & jurisprudence*; D011307:Drug Prescriptions; D004335:Drug and Narcotic Control / Q000191:economics / Q000331:legislation & jurisprudence*; D016568:Drugs, Generic; D006801:Humans; D010330:Patents as Topic / Q000331:legislation & jurisprudence*; D013997:Time Factors; D014481:United States
D016568:Drugs, Generic