Orphan drug regulations in Europe.
D017277:Drug Approval; D004335:Drug and Narcotic Control / Q000191:economics / Q000379:methods* / Q000639:trends; D005060:Europe; D040541:Marketing / Q000191:economics / Q000331:legislation & jurisprudence / Q000639:trends; D009965:Orphan Drug Production / Q000191:economics / Q000331:legislation & jurisprudence*