Leetheeragul, J., R. Sirisomboon, K. Pimol, T. Lertbunnaphong, and P. Limsiri. “Incidence and Pregnancy Outcomes of Primary Postpartum Hemorrhage Following Implementation of Postpartum Drape with a Calibrated Bag after Normal Vaginal Delivery”. Siriraj Medical Journal, vol. 72, no. 3, Mar. 2020, pp. 219-25, doi:10.33192/Smj.2020.30.