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Association of pre-pregnancy physical activity level and physical activity in the first trimesterTodorovic, J; Gojnic-Dugalic, M; Terzic-Supic, Z; Dugalic, S; Bjegovic-Mikanovic, V; Stamenkovic, Z; Davidovic, M; Piperac, P; Santric-Milicevic, M · European Journal of Public Health · 2018