Follow-up questionnaires

Approximately five years after completion of the first questionnaire, a follow-up questionnaire was distributed. About 70% were returned completed. This questionnaire provides us with information on changes in diet, lifestyle and health.

A second follow-up questionnaire was sent in 2007, approximately 10 years after the participants joined the study. About 61% were returned completed.

The third follow-up questionnaire was sent in 2010, approximately 15 years after the participants joined the study. About 65% were returned completed.

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