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The middle part (1931-1952)

Twins born between 1931 and 1952 were ascertained in another way, namely by means of the information available through CRS, which was established in 1968. From CRS however, it does not appear whether a person is a twin or not, and the linking between family members is not sufficient either for these cohorts. A search in CRS extracted all persons born on the same day, in the same parish and with the same historical surname. Then a letter was sent to all these people asking whether they were a twin or not, and finally the twins were matched in pairs.