The purpose of this study is to determine the optimum dosage and application method of Glycosides Of Tripterygium Wilfordii Hook(GTW) for Henoch-Schönlein Purpura Nephritis(HSPN) in children, and develop into the normal treatment protocols for Henoch-Schönlein Purpura Nephritis in children.
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24-hour urinary protein quantity
Timeframe: Changes in the quantity of urinary protein at week 1ăweek2ăweek 4ăweek6ăweek8ăweek10 and week12 of the treatment phase and at week16ăweek20ăweek24ăweek28ăweek32ăweek36ăweek40ăweek44ăweek48 of the follow-up phase compared with baseline