Disease Management; Meningitis; Practice Patterns, Physicians'; Adolescent; Adult; Aged; Anti-Bacterial Agents/therapeutic use; Cerebrospinal Fluid/cytology; Cerebrospinal Fluid/microbiology; Cohort Studies; Female; Guideline Adherence; Hospitals, General/statistics & numerical data; Humans; Leukocytosis/diagnosis; Leukocytosis/etiology; Male; Medical Audit; Meningitis/cerebrospinal fluid; Meningitis/diagnosis; Meningitis/drug therapy; Meningitis/epidemiology; Meningitis/microbiology; Meningitis, Aseptic/cerebrospinal fluid; Meningitis, Aseptic/diagnosis; Meningitis, Aseptic/epidemiology; Middle Aged; Practice Guidelines as Topic; Practice Patterns, Physicians'/statistics & numerical data; Retrospective Studies; Spain/epidemiology; Tomography, X-Ray Computed/statistics & numerical data