Development and design of the BELpREG registration system for the collection of real-world data on medication use in pregnancy and mother-infant outcomes by Sillis, L, Foulon, V, Allegaert, K, Bogaerts, A, De Vos, M, Hompes, T, Smits, A, Van Calsteren, K, Verbakel, JY, Ceulemans, M