TY - JOUR A1 - Higgins, J.P.T. A1 - Thompson, S.G. A1 - Deeks, J.J. A1 - Altman, D.G. T1 - Measuring inconsistency in meta-analyses Y1 - 2003 DO - 10.1136/bmj.327.7414.557 VL - 327 IS - 7414 ER -