conceived with in vitro fertilization and children conceived without in vitro fertilization.
METHODS. A population-based, cohort study, including all live-born singletons and twins
born in Denmark between January 1, 1995, and December 31, 2000, was performed.
Children conceived with in vitro fertilization (9255 children) were identified through the In
Vitro Fertilization Register; children conceived without in vitro fertilization (394713) were …