Fig. 1From: Response rate of patient reported outcomes: the delivery method mattersFlowchart of study participants. Patients who participated in a previous study in 2014 were reapproached for participation. Before 2011 email was not registered at the first visit to the hospital. As a result, an email was available for a minority of the patients making randomization impossible. * All groups were matched for age and the time since the last visitBack to article page