Pornprasertsuk, W., Treetampinich, C., Israngura Na Ayudhya, N., O-Prasertsawat, P. and Rattanasiri, S. (2017) “Relationship between Alteration of Sacral Pain and Cervical Progression in Latent Phase of Labor : Diagnostic Study”, Thai Journal of Obstetrics and Gynaecology. Bangkok, Thailand, 16(2), pp. 97–102. available at: https://he02.tci-thaijo.org/index.php/tjog/article/view/82275 (accessed: 12 September 2026).