1. State Key Laboratory of Medicinal Chemical Biology; Key Laboratory of Bioactive Materials; Ministry of Education; Nankai University; Tianjin 300071 China
2. Department of Pathology; St. Jude Children Research Hospital; Memphis TN 38105 USA
3. Department of Urology Surgery; Children's Hospital; Tianjin 300074 China
4. Center for Research and Development of Chinese Medicine; Tianjin State Key Laboratory of Modern Chinese Medicine; Tianjin University of Traditional Chinese Medicine; Tianjin 300193 China