At T0, questionnaires were distributed to 5108 patients
participating in the 18 DMPs and completed by 2619 respondents
(51% response rate). One year later (T1), questionnaires were
distributed to 4693 patients still participating in the 18 DMPs and
completed by 2191 respondents (47% response rate). A total of
1447 patients completed questionnaires at both T0 and T1.