Because of sampling issues, studies of identical twins separated at birth did not become possible until the early 1990s.

Name: Because of sampling issues, studies of identical twins separated at birth did not become possible until the early 1990s.
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Studies of identical twins separated at birth did not become possible until the early 1990s because of sampling issues. Before that, it was difficult to find enough identical twins who had been separated at birth to conduct meaningful studies.

Because of Sampling Issues, Studies of Identical Twins Separated at Birth