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. Author manuscript; available in PMC: 2021 Apr 12.
Published in final edited form as: Twin Res Hum Genet. 2019 Sep 23;22(6):499–507. doi: 10.1017/thg.2019.72

Fig. 2.

Fig. 2.

(a) Overview of the birth cohorts included in major surveys in the Danish Twin Registry since 1994. (b) Overview of the ages at which twins are included in major surveys in the Danish Twin Registry since 1994.