Unfortunately, a small section of text in the above paper (in the Results, Individual changes: combined symptom scores, Symptom mean exceeding a set value) was reported incorrectly. It should have appeared as follows. “Symptom-based events, defined as a mean symptom value exceeding a level of 1.5, 2.0 or 2.5 for 3 consecutive days, showed a relatively high degree of concurrence at the lower levels (table 4). A symptom-based exacerbation, defined as a level of 1.5 for 3 days, was seen in almost all patients at some point, 63.3% correlating with an event-based exacerbation.” The authors apologise for this error.
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