3Rudan I,Boschi-Pinto C,Biloglav Z,Mulholland K,CampbellH.Epidemiology and etiology of childhood pneumonia[J].BullWorld Health Organ,2008,86(5):408-416.
4Lupisan SP,Ruutu P,Erma Abucejo-Ladesma P,Quiambao BP,Gozum L,Sombrero LT,et al.Predictors of death from severepneumonia among children 2-59 months old hospitalized in Bohol,Philippines:implications for referral criteria at a first-level healthfacility[J].Trop Med Int Health,2007,12(8):962-971.
5Magret M,Lisboa T,Martin-Loeches I,Máez R,Nauwynck M,Wrigge H,et al.Bacteremia is an independent risk factor for mor-tality in nosocomial pneumonia:a prospective and observationalmulticenter study[J].Crit Care,2011,15(1):R62.
6Heffelfinger JD,Davis TE,Gebrian B,Bordeau R,Schwartz B,Dowell SF.Evaluation of children with recurrent pneumonia diag-nosed by World Health Organization criteria[J].Pediatr Infect DisJ,2002,21(2):108-112.
7Dickerson RN,Henry NY,Miller PL,Minard G,Brown RO.Lowserum total calcium concentration as a marker of low serum ionizedcalcium concentration in critically ill patients receiving specializednutrition support[J].Nutr Clin Pract,2007,22(3):323-328.