Letter to the editor regarding "Can urinary biomarkers detect obstruction defined by renal functional loss in antenatal hydronephrosis?" by Ünsal Özkuvancı, M. İrfan Dönmez, Orhan Ziylan, Tayfun Oktar, Canan Küçükgergin, Bilal Çetin, Selçuk Erdem, Şule Seçkin.