Barriers and strategies for recruitment of pregnant women in contemporary longitudinal birth cohort studies. - Rokicki S; Gobburu A; Weidner M; Azam N; Jansen M; Rivera-Núñez Z; De Resende A; Parmar V; Bachmann G; Reilly N; Panettieri R; Dominguez-Bello MG; et al. (BMC medical research methodology, 2025)