Signe Opdahl

IMPORTANCE: It is critical that women undertaking medically assisted reproductive (MAR) treatment and their clinicians know whether the treatments are associated with an increased risk of hormone-related cancers. OBJECTIVE: To determine th…

BACKGROUND: A higher risk of placenta previa after assisted reproductive technology (ART) is well established. The underlying mechanisms are poorly understood, but may relate to embryo culture duration, cryopreservation, and cause of infert…

Researchers interested in causal questions must deal with two sources of error: random error (random deviation from the true mean value of a distribution), and bias (systematic deviance from the true mean value due to extraneous factors). F…