ISUOG practice guidelines: role of ultrasound in the prediction of spontaneous preterm birth - Coutinho, Conrado Milani; Sotiriadis, A.; Odibo, A.; Khalil, A.; D'Antonio, F.; Feltovich, H.; Salomon, L. J.; Sheehan, P.; Napolitano, R.; Berghella, V.; Costa, F. da Silva (Ultrasound in Obstetrics and Gynecology, 2022)