Novel sonographic reference charts for early pregnancy based on known gestational age by Julia Häusler, M.D., Alexander M Quaas, M.D., Ph.D., Manuel Fischer, Ph.D., Andreas Schötzau, M.Sc., Fiona Pugin, Ph.D., Christian De Geyter, M.D., Ursula Gobrecht-Keller, M.D., Beatrice Mosimann, M.D., Gwendolin Manegold-Brauer, M.D.

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