title: Reply.
authors.affiliation: Department of Obstetrics, University of Parma, Parma, Italy. Electronic address: tullioghi@yahoo.com.
authors.forename: Tullio
authors.initials: T
authors.lastname: Ghi
authors.affiliation: Department of Internal Medicine, Aging, and Kidney Diseases, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.
authors.forename: Daniela
authors.initials: D
authors.lastname: Degli Esposti
authors.affiliation: Department of Internal Medicine, Aging, and Kidney Diseases, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Borghi
authors.affiliation: Department of Obstetrics and Gynecology, Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: Montaguti
mesh_terms: D015150:Echocardiography, Doppler; D005260:Female; D006801:Humans; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000000981:diagnostic imaging*; D059285:Pregnancy, Twin / Q000502:physiology*; D016216:Ultrasonography, Prenatal