Chemical and biological assessment of a Chinese herbal decoction containing Radix Astragali and Radix Angelicae Sinensis: Determination of drug ratio in having optimized properties - Dong, T TX; Zhao, K J; Gao, Q T; Ji, Z N; Zhu, T T; Li, J; Duan, R; Cheung, A W; Tsim, K WK (J Agric Food Chem, 2006)