meta-analysis National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine prognosis treatment outcome adult adolescent aged middle aged risk factors regression analysis drug resistance bacteremia / drug therapy* microbial neoplasms / complications* neutropenia / complications* bacterial infections / diagnosis* predictive value of tests bacteremia / epidemiology gram-negative bacterial infections / diagnosis g p bodey anti-bacterial agents / administration & dosage neutropenia / microbiology anti-bacterial agents / therapeutic use* leukocyte count neoplasms / microbiology bacterial infections / drug therapy l s elting pmid:9332520 doi:10.1086/514550 e b rubenstein bacterial infections / mortality drug therapy / economics drug therapy / methods gram-negative bacterial infections / drug therapy gram-negative bacterial infections / mortality gram-positive bacterial infections / diagnosis gram-positive bacterial infections / drug therapy gram-positive bacterial infections / mortality randomized controlled trials as topic / statistics & numerical data