IL6 and angina pectoris: Secondary outcomes include Seattle angina scale score, Chinese medicine syndromes and electrocardiograph (at weeks 0, 1, 2, 4), myocardial nuclides perfusion, measurement of wall motion score index and left ventricular ejection fraction, serum inflammation factors such as C-reactive protein, high sensitive-C-reactive protein, interleukin-6, matrix metalloproteinase-9, and so on (at weeks 0, 4).