ENGOT Groups AGO -Austria Arbeitsgemeinschaft Gynaekologische Onkologie Austria Website BGOG Belgian Gynaecological Oncology Group Website DGOG The Dutch Gynecological Oncology Group Website EORTC-GCG European Organisation for Research and Treatment of Cancer-Gynaecological Cancer Group Website GINECO Groupe d’Investigateurs Nationaux pour l’Etude des Cancers Ovariens, France Website HeCOG Hellenic Cooperative Oncology Group, Greece Website AGO-Germany Arbeitsgemeinschaft Gynaekologische Onkologie Studiengruppe Website NOGGO North-Eastern German Society of Gynaecologic Oncology Website ICORG Cancer Trials Ireland Website MITO Multicenter Italian Trials in Ovarian Cancer, Italy Website MaNGO Mario Negri Gynecologic Oncology group; Italy Website NSGO Nordic Society of Gynecologic Oncology Website GEICO Grupo Español de Investigación en Cáncer de Ovario, Spain Website TRSGO Turkish Society of Gynecologic Oncology Website SGCTG Scottish Gynaecological Clinical Trials Group Website NCRI National Cancer Research Institute Website ISGO Israely Society of Gynecologic Oncology GROINS GROningen INternational Study on Sentinel nodes in Vulvar cancer, The Netherlands SAKK Swiss Group for Clinical Cancer Research Website CEEGOG Central and Eastern European Gynecologic Oncology Group (Czech Republic, Slovakia, Poland, Slovenia, Hungary, Ukraine and Georgia) PGOG Polish Gynecologic Oncologic Group