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Figure 1 :Plotting of our normative ( ) and abnormal ( ) results on Siroky (a, b), Liverpool (c, d) and fl ow-volume nomograms developed by us (e, f; PGIMER nomograms)

Figure 1 :Plotting of our normative ( ) and abnormal ( ) results on Siroky (a, b), Liverpool (c, d) and fl ow-volume nomograms developed by us (e, f; PGIMER nomograms)