Mongkolmafai, Ornwitsanate, and Thumwadee Tangsiriwatthana. 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). Bangkok, Thailand:302-10. https://doi.org/10.14456/tjog.2016.42.