Plans to promote participant retention and complete follow-up {18b}
The return of questionnaires is monitored by the local and the lead investigator. Participants are contacted by telephone by the local investigator in case of missing questionnaires. Questionnaires can be provided on the outpatient clinic, send digital by mail or a hard copy can be sent by post. Patients will also be contacted by phone if the returned questionnaire does not meet the requirements of assessment.