ISUOG Practice Guidelines: role of ultrasound in the prediction of spontaneous preterm birth. - Coutinho CM; Sotiriadis A; Odibo A; Khalil A; D'Antonio F; Feltovich H; Salomon LJ; Sheehan P; Napolitano R; Berghella V; da Silva Costa F (Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology, 2022)