目的减少医院感染的发生率。
Objective To reduce the infection prevalence rate in hospital.
目的：加强内镜手术的安全管理，降低医院感染的发生率。
Objective To reinforce the safety management of endoscopy, and reduce hospital cross infection.
目的了解住院患者下呼吸道医院感染的发生率及相关因素。
Objective to investigate the morbidity and relative factors of nosocomial lower respiratory tract infections in hospital.
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