RT Journal Article SR Electronic T1 Comparative effectiveness of combination treatment for hypertension in black Africans JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP 112 OP 112 DO 10.1136/bmjebm-2019-111251 VO 25 IS 3 A1 Igho Onakpoya YR 2020 UL http://ebm.bmj.com/content/25/3/112.abstract AB