TY - JOUR T1 - Value and usability of unpublished data sources for systematic reviews and network meta-analyses JF - Evidence Based Medicine JO - Evid Based Med SP - 208 LP - 213 DO - 10.1136/ebmed-2016-110494 VL - 21 IS - 6 AU - Nicholas James Anthony Halfpenny AU - Joan Mary Quigley AU - Juliette Catherine Thompson AU - David Alexander Scott Y1 - 2016/12/01 UR - http://ebm.bmj.com/content/21/6/208.abstract N2 - ER -