Efficacy and safety of Xijiao Dihuang decoction in treating Henoch-Schönlein purpura: Study protocol for systematic review.

Background: Henoch-Schönlein purpura is one of the most common systemic vascular inflflammatory disease in childhood with purpuric rash, arthritis, renal involvement, and abdominal pain. As a treatment for it, Xijiao Dihuang decoction, a traditional herbal formula, has been used. The object of this systematic review and meta-analysis is to assess the effificacy and safety on Xijiao Dihuang decoction in treating allergic purpura.