The effect of an exercise program in pregnancy on vitamin D status among healthy, pregnant Norwegian women: a randomized controlled trial.
Miriam K GustafssonPål R RomundstadSigne Nilssen StafneAnne-Sofie HelvikAstrid Kamilla StunesSiv MørkvedKjell Åsmund SalvesenPer Medbøe ThorsbyMats Peder MostiUnni SyversenPublished in: BMC pregnancy and childbirth (2019)
ClinicalTrials.gov: NCT00476567 , registered May 22, 2007.