RT Journal Article SR Electronic T1 NNTs and NNHs: handle with care JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 133 OP 133 DO 10.3399/bjgp17X689797 VO 67 IS 656 A1 Adrian A Root A1 Liam Smeeth YR 2017 UL http://bjgp.org/content/67/656/133.abstract AB