RT Journal Article SR Electronic T1 β-Blockers as first-line therapy for hypertension JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1424 OP 1425 VO 163 IS 11 A1 George A. Heckman A1 Alexandra Papaioannou A1 William Parkinson A1 Christopher A. Patterson YR 2000 UL http://www.cmaj.ca/content/163/11/1424.2.abstract