Comorbidities were assessed at treatment start with the Self-Administered Comorbidity Questionnaire (SCQ), originally developed by Sangha, Stucki, Liang, Fossel and Katz [19]. The SCQ asks “Do you have any of the following problems?” and lists 15 common medical problems. For each problem, participants were asked “Do you receive treatment?” as a proxy for disease severity, followed by the question, “Does it limit your daily activities?” Participants scored a maximum of three points for each condition (Supplementary File 1).

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