关于"周期性健康检查"不正确的理解是

A．应用格式化的健康筛检表格，针对不同年龄、性别而定期进行的健康检查

B．研究的对象是无症状的个体

C．目的是早期发现患者的健康危害因素

D．主要针对一级预防

E．针对各种高危人群和不同年龄、性别的人群检查，可降低相关疾病的发病率和死亡率

Which of the following is not a recommended procedure for compliance with the Standards of Professional Conduct relating to material nonpublic information（）

A. Conduct appropriate interdepartmental communications.

B. Establish Proprietary trading procedures.

C. Avoid public dissemination of material nonpublic information.