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Joint assessment, in the reviewed articles between 2009–2015, for missing costs and effects, of two components. The x-axis is the missingness method assumptions: unknown (UNK), single imputation (SI), complete case analysis (CCA), multiple imputation (MI) and sensitivity analysis (SA). The y-axis is the ordered classification for the quality judgement (scores) to support these assumptions: E, D, C, B, A
