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The oldest part (1870-1930)

At the beginning of 1953 all vicars in Denmark’s 2,000 parishes were asked to go through the birth registers in search for twin pairs born after 1870. Once the twins were reported, a mere detective work started in order to identify them, a work which involved contact to population registers, various regional archives and other public sources. After having been identified the twins or their close relatives received a short questionnaire asking how much they were alike, and which diseases they had had. A total of 14,000 pairs where both twins had survived to the age of 6 were ascertained this way.

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