- https://www.analesdepediatria.org/es-ectasia-pielica-antenatal-signo-guia-articulo-S1695403321001545
- https://www.analesdepediatria.org/es-pdf-S1695403321001545
- https://www.analesdepediatria.org/en-antenatal-hydronephrosis-key-sign-for-articulo-S234128792100137X
- https://www.analesdepediatria.org/en-pdf-S234128792100137X