TY - JOUR T1 - Catalogue of bias: allocation bias JF - BMJ Evidence-Based Medicine JO - BMJ EBM SP - 20 LP - 21 DO - 10.1136/ebmed-2017-110882 VL - 23 IS - 1 AU - David Nunan AU - Carl Heneghan AU - Elizabeth A Spencer Y1 - 2018/02/01 UR - http://ebm.bmj.com/content/23/1/20.abstract N2 - ER -