I-Tuporn, N., Ratanasiri, A., Nutravong, T., Boonprasert, K. and Na Pikul, T. 2019. Risk Scoring System for the Prediction of Postpartum Blood Loss over 300 mL at Chiang Rai Regional Hospital. Siriraj Medical Journal. 71, 2 (Mar. 2019), 10–116. DOI:https://doi.org/10.33192/Smj.2019.17.