Protection of ethanol extract and fractions from Polygonatum odoratum on renal lesion in diabetic rats Preventive effects of multi-glycoside of Tripterygium wilfordii on glomerular lesions in experimental diabetic nephropathy Effect of Compound Rhizoma Coptidis Capsula on diabetic nephropathy and hemorrheological abnormalities in rats Infect of Pingshen decoction on serum HGF, Cys C and TGF-β1 diabetic nephropathy in early stage