Chanakarn Suthisuntornwong และ Thumwadee Tangsiriwatthana. (2022) Hot Patch Applied to the Lower Back for Pain Relief during the Active Phase of the First-stage Labor: A randomized controlled trial. <i>Thai Journal of Obstetrics and Gynaecology</i>, <i>30</i>(2), 109-119.Chanakarn Suthisuntornwong และ Thumwadee Tangsiriwatthana. "Hot Patch Applied to the Lower Back for Pain Relief during the Active Phase of the First-stage Labor: A randomized controlled trial". Thai Journal of Obstetrics and Gynaecology 30 (2022):109-119.Chanakarn Suthisuntornwong และ Thumwadee Tangsiriwatthana. Hot Patch Applied to the Lower Back for Pain Relief during the Active Phase of the First-stage Labor: A randomized controlled trial. PIMDEE Co. Ltd.:ม.ป.ท. 2022.