Department;
of;
Critical;
Care;
Medicine,the;
People’s;
Hospital;
of;
Three;
Gorge;
University;
Department;
of;
Emergency,Shanghai;
Changzheng;
Hospital,Second;
Military;
Medical;
University;
Department;
of;
Paediatrics,Maternal;
and;
Child;
Health;
Care;
Hospital;
of;
Jingshan;
hospital; infections; risk; factor; case; cohort; study;