CDC与NHSN是并列还是从属？

Health care–associated infections (HAIs) are infections associated with health care, generally occurring on or after the third calendar day of admission to a hospital. Surveillance classification criteria are established by the Centers for Disease Control and Prevention’s (CDC) National Healthcare Safety Network (NHSN). The definitions related to vascular catheter–related infections are summarized in Table E1.

医院获得性感染(Health care–associated infections，HAIs)是指与住院相关的感染，常指在入院后的≥3d发生的感染。监测分类标准由CDC的国家医疗安全网络（National

Healthcare Safety Network，NHSN）制定。血管导管相关感染的定义见表E1.

CDC与NHSN是并列还是从属？除了真的知道可以从语法上看出来吗？