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  Indian J Med Microbiol
 

Figure 3: Tube curvature comparisons: 6.5, 6.0, 5.5, 5.0, and 4.5 mm ID from left to right

Figure 3: Tube curvature comparisons: 6.5, 6.0, 5.5, 5.0, and 4.5 mm ID from left to right