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children birth weight birth weight patient urethral valves journal relapse number change nephrotic syndrome kidney study effect course university table nephron bladder function valve erasmus university rotterdam urethral bladder function syndrome nephrotic growth difference report meta-analysi sibling nephrology nephron endowment control change growth restriction vu university title factor paediatric nephrology ultrasound lbw patients antenatal growth retardation rotterdam restriction hypertension follow-up brother month centre michiel f journal title length disease range diagnosis erasmu length schreuder tract department monozygotic twins heterogeneity cytotoxic agents corticosteroid group lbw children category physiol hydronephrosi proteinuria kjellberg birth defects research nephrol nephron number center quintile 6 months period control children review