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Mathers, Jonathan, Thomas Keeley, Laura Jones, Melanie Calvert, Paula Williamson, Janet Jones, Christel McMullan, Susan Wright, et Bridget Young. "Using Qualitative Research to Understand What Outcomes Matter to Patients: Direct and Indirect Approaches to Outcome Elicitation." Trials 2015.

Mathers, Jonathan, et al. "Using Qualitative Research to Understand What Outcomes Matter to Patients: Direct and Indirect Approaches to Outcome Elicitation." Trials 2015.