Microscopy / Evidence Based Medicine / Tuberculosis / Humans / Mycobacterium tuberculosis / Cost Benefit Analysis / Reproducibility of Results / Microbial Sensitivity Tests / Agar / Sensitivity and Specificity / Health Care Costs / Predictive value of tests / Cost Benefit Analysis / Reproducibility of Results / Microbial Sensitivity Tests / Agar / Sensitivity and Specificity / Health Care Costs / Predictive value of tests