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A type of steroid-sensitive nephrotic syndrome in which relapses occur at a frequency of two or more relapses (albumin urine dipstick at least 3+ or proteinuria over 40 mg/m2/d or urinary protein to creatinine ratio at least 2000 mg/g for 3 consecutive days) within 6 months of initial response or four or more relapses in any 12-month period. [ORCID:0000-0002-2234-4248, PMID:29910038]
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