Ultrasound-assisted intraoperative localization and laparoscopic management of a previously missed unruptured retroperitoneal ectopic pregnancy. - Protopapas, Athanasios; Akrivos, Nikolaos; Athanasiou, Stavros; Chatzipapas, Ioannis; Domali, Aikaterini; Loutradis, Dimitrios (Gynecological Surgery, 2014)