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Ertmann, Ruth K., Dagny R. Nicolaisdottir, Jakob Kragstrup, Volkert Siersma, و Melissa C. Lutterodt. "Sleep Complaints in Early Pregnancy. A Cross-sectional Study Among Women Attending Prenatal Care in General Practice." BMC Pregnancy Childbirth 2020.

Ertmann, Ruth K., et al. "Sleep Complaints in Early Pregnancy. A Cross-sectional Study Among Women Attending Prenatal Care in General Practice." BMC Pregnancy Childbirth 2020.