Mongkolmafai, O. and Tangsiriwatthana, T. 2016. Validity of the Risk of Malignancy Index 4 to Preoperative Evaluation of Patients with Adnexal Masses. Thai Journal of Obstetrics and Gynaecology. 24, 4 (Dec. 2016), 302–310. DOI:https://doi.org/10.14456/tjog.2016.42.