Fig. 1From: Study design of a stepped wedge cluster randomized controlled trial to evaluate the effect of a locally tailored approach for preconception care – the APROPOS-II studyTimeline of the APROPOS-II study. All participating municipalities start with a control-phase, which will last 6–16 months depending on randomization order. After the control phase, the intervention will be implemented stepwise in every municipalityBack to article page