慢性乙型肝炎 证型分布 肝郁脾虚证 湿热中阻证 肝胆湿热证 肝气郁结证 肝肾阴虚证 瘀血阻络证 脾气虚证 脾肾阳虚证 chronic hepatitis B distribution of TCM syndrome liver stagnation and spleen deficiency retention of damp-heat syndrome of damp-heat of liver and gallbladder liver qi stagnation syndrome syndrome of yin deficiency of liver and kidney syndrome of blood sta