Chaotrakool, Cheun, Suppasiri Hayakungchat, and Thumwadee Tangsiriwatthana. 2019. “Efficacy of Oral Isosorbide Mononitrate Sustained-release for Pre-induction Cervical Ripening in Term Pregnant Women in an Outpatient Setting: A randomized controlled trial”. Thai Journal of Obstetrics and Gynaecology 27 (1). Bangkok, Thailand:13-21. https://doi.org/10.14456/tjog.2019.3.