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Nephrotic syndrome(NS)is a common disease in children with a group of symptoms including heavy proteinuria(≥50 mg/kg per 24 hours),hypoalbuminaemia,hypercholesterolaemia and edema.Bartter syndrome(BS)is a clinically and genetically heterogenous kidney disease characterized by hypokalemia,hypochloremic metabolic alkalosis,obvious increase of rennin,angiotesin II,and normal blood pressure.