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infection hygiene study infant patient hand hygiene bloodstream intervention care unit parent nurse nosocomial compliance hand hygiene compliance control bloodstream infections nosocomial bloodstream infections program nursing hospital healthcare education program children education effect hand disinfection events catheter group prevention healthcare professionals practice observation number disinfection result period change birth chapter weight birth weight infants health vlbw infants incidence event 1000 patient days review 1000 cvc days professional helder procedure analysis staff research nosocomial infections hand hygiene practices patient contact level behavior posttest protocol hand hygiene protocols reduction infection prevention preterm infants contact quality shift trend child worker mother care units hand hygiene events system hand disinfection effectiveness