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Tendal, Britta; Higgins, Julian P T; Jüni, Peter; Hróbjartsson, Asbjørn; Trelle, Sven; Nüesch, Eveline; Wandel, Simon; Jørgensen, Anders W; Gesser, Katarina; Ilsøe-Kristensen, Søren; Gøtzsche, Peter C (2009). Disagreements in meta-analyses using outcomes measured on continuous or rating scales: observer agreement study. BMJ, 339(b3128), b3128. London: BMJ Publishing Group 10.1136/bmj.b3128
