PT - JOURNAL ARTICLE AU - Barbara Sibbald TI - Drug patent protection: How long is long enough? DP - 2001 May 01 TA - Canadian Medical Association Journal PG - 1331--1331 VI - 164 IP - 9 4099 - http://www.cmaj.ca/content/164/9/1331.1.short 4100 - http://www.cmaj.ca/content/164/9/1331.1.full SO - CMAJ2001 May 01; 164