糖尿病周围神经病变 中医证型 阳虚寒凝血瘀证 气虚血瘀证 气阴两虚血瘀证 痰瘀阻络证 肝肾亏虚证 阴虚血瘀证 diabetic peripheral neuropathy (DPN) TCM syndromes syndrome of yang deficiency,cold coagulation and blood stasis syndrome of qi deficiency and blood stasis syndrome of qi and yin deficiency and blood stasis syndrome of obstruction of phlegm and blood sta