Women of reproductive age living in the North of the Netherlands: Lifelines Reproductive Origins of Adult Health and Disease (Lifelines-ROAHD) cohort.

Due to the embedding of Lifelines-ROAHD cohort in the original Lifelines cohort, the women will be longitudinally followed. Additionally, we aim to collect data with a second online questionnaire aiming to complete women's reproductive histories, by collecting data about potential first and subsequent pregnancies conceived after the date of completion of baseline Lifelines-ROAHD cohort.