主动脉瓣关闭不全晚期最主要的并发症是（）

A.肺水肿

B.咯血

C.心房颤动

D.心力衰竭

E.肺部感染

Standard Ⅵ (C) , Referral Fees, is applicable to :（）

A. only cash consideration received for the recommendation of products or services.

B. only cash consideration paid for the recommendation of products or services.

C. all consideration received or paid for the recommendation of products or services.