S. Raungkaewmanee, C. Phaloprakarn, S. Manusirivithaya, and B. Wiriyasirivaj, “A Two-hour Urinary Protein-creatinine Ratio for Predicting Significant Proteinuria in Preeclampsia”, Thai J Obstet Gynaecol, vol. 17, no. 4, pp. 196–203, May 2012.