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When performing a re-analysis of our study data, we found an error in the calculation of the transition matrices in our published analyses relating to how patients’ asthma-control states at weekly study visits had been imputed and subsequently used in our original model. We have therefore reanalysed the data using revised transition matrices and also performed additional sensitivity analyses to confirm the reliability and validity of the conclusions.

Comment on: “Cost Effectiveness of Tiotropium in Patients with Asthma Poorly Controlled on Inhaled Glucocorticosteroids and Long-Acting β-Agonists”