RT Journal Article SR Electronic T1 Thresholds JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 467 OP 467 DO 10.3399/bjgp21X717305 VO 71 IS 711 A1 Saul Miller YR 2021 UL http://bjgp.org/content/71/711/467.abstract AB