Effects of tetrandrine on Ang II-induced cardiomyocyte hypertrophy and p-ERK1/2 expression Changes of c-fos,c-jun mRNA expressions in cardiomyocyte hypertrophy induced by angiotensinⅡ and effects of tanshinone ⅡA Protection of salvianolic acid B on isoproterenol-induced cardiomyocyte hypertrophy of neonatal rats