RT Journal Article SR Electronic T1 Using CPRD data for public health research JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 334 OP 334 DO 10.3399/bjgp18X697745 VO 68 IS 672 A1 Willie Hamilton YR 2018 UL http://bjgp.org/content/68/672/334.abstract AB