Correction to: Use of daily electronic patient-reported outcome (PRO) diaries in randomized controlled trials for rheumatoid arthritis: rationale and implementation.

After publication of the original article [1], the authors have notified us of an error in language used in the text.

Correction to: Trials

https://doi.org/10.1186/s13063-019-3272-0

After publication of the original article [1], the authors have notified us of an error in language used in the text:

The first sentence of the 6th paragraph under the Methods sections should read “Training was completed for each individual patient.”

The first sentence of the 3rd paragraph under Training of patients and site staff should read: “The site staff underwent face-to-face training and hands-on experience with the devices at investigator meetings or online training modules and took 2 hours to complete on average.”

The phrase “took 2 hours to complete on average” was moved from the first sentence to the second one.