TY - JOUR AU - Edwards, Adrian AU - Mrcgp, Glyn Elwyn AU - Hood, Kerry AU - Rollnick, Stephen IS - 2 JA - Journal of Evaluation in Clinical Practice PY - 2000 TI - Judging the 'weight of evidence' in systematic reviews:introducing rigour into the qualitative overview stage by assessing Signal and Noise VL - 6 ER -