Triaging women with ovarian masses for surgery: observational diagnostic study to compare RCOG guidelines with an International Ovarian Tumour Analysis (IOTA) group protocol. - Van Calster, B; Timmerman, D; Valentin, L; McIndoe, A; Ghaem-Maghami, S; Testa, AC; Vergote, I; Bourne, T (BJOG: An International Journal of Obstetrics & Gynaecology, 2012)