Potential role of uterine artery pulsatility index (UAPI) in the ultrasonographic diagnosis of stage I placental site trophoblastic tumor (PSTT). Issue 2 (17th April 2019) - Petrone, M.; Cavoretto, P.; Cioffi, R.; Valsecchi, L.; Bocciolone, L.; Rabaiotti, E.; Galdini, A.; Mangili, G.; Candiani, M.