HNF1B and autosomal recessive polycystic kidney disease: Of the four children who required dialysis, two had a genetic diagnosis of ARPKD (one at 6 months, and the other at 8 years of age), one had a diagnosis of HNF1B-related disease and ARPKD and was 6 months old and the last one was 6 years old and had an inconclusive genetic diagnosis.