Supplementary Table S2. Surgical complications following salvage intervention for ureteropelvic junction obstruction.

Surgical intervention	Complication	Grade
Tertiary ureterocalicostomy	Wound infection	I
Secondary endopyelotomy	Pyelonephritis	II
Tertiary robotic pyeloplasty	Pyelonephritis	II
Tertiary ureterocalicostomy	Pneumonia, parapneumonic effusion requiring drainage	IIIa
Secondary open pyeloplasty	Pulmonary embolism, rhabdomyolysis requiring intensive care	IV