Bacterial Infections; Osteoarthritis; Age Factors; Anti-Bacterial Agents/administration & dosage; Anti-Bacterial Agents/therapeutic use; Bacterial Infections/diagnosis; Bacterial Infections/drug therapy; Bacterial Infections/epidemiology; Bacterial Infections/etiology; Catheterization/adverse effects; Cefotaxime/administration & dosage; Cefotaxime/therapeutic use; Cross Infection/drug therapy; Cross Infection/epidemiology; Cross Infection/etiology; Cross Infection/microbiology; Drug Therapy, Combination; Enterobacteriaceae/isolation & purification; Escherichia coli Infections/diagnosis; Escherichia coli Infections/drug therapy; Escherichia coli Infections/etiology; Humans; Incidence; Infant, Newborn; Intensive Care Units, Neonatal; Osteoarthritis/diagnosis; Osteoarthritis/drug therapy; Osteoarthritis/epidemiology; Osteoarthritis/etiology; Osteoarthritis/microbiology; Staphylococcal Infections/diagnosis; Staphylococcal Infections/drug therapy; Staphylococcal Infections/etiology; Staphylococcal Infections/microbiology; Staphylococcus aureus/isolation & purification; Streptococcal Infections/diagnosis; Streptococcal Infections/drug therapy; Streptococcal Infections/microbiology; Streptococcus agalactiae/isolation & purification; Treatment Outcome