TY - JOUR T1 - Evidence about complex interventions JF - British Journal of General Practice JO - Br J Gen Pract SP - 119 LP - 120 DO - 10.3399/bjgp19X701453 VL - 69 IS - 680 AU - Louisa Polak Y1 - 2019/03/01 UR - http://bjgp.org/content/69/680/119.3.abstract N2 - I agree with almost everything McCartney and Finnikin say,1 and am delighted that they have said it so clearly and succinctly. But I am concerned that they risk making ‘systematic interrogation of all new healthcare policies for evidence and cost-effectiveness’ sound easier than it is.The traditional hierarchy of types of … ER -