UGT1A1 and Dubin-Johnson syndrome: In addition, 20 patients were diagnosed with a genetic hyperbilirubinemia syndrome: Dubin-Johnson syndrome (ABCC2, n = 17), Rotor syndrome (SLCO1B1/B3, n = 1), Crigler-Najjar syndrome (UGT1A1, n = 1) and Gilbert syndrome (UGTA1, n = 1).