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Figure 1: Receiver Operating Characteristic curves for lower lip to chin distance, tragus to mouth angle, thyromental distance, neck circumference, ratio of height to thyromental distance and body mass index showing the best cutoff values and sensitivity and specificity of each individual assessment tool

Figure 1: Receiver Operating Characteristic curves for lower lip to chin distance, tragus to mouth angle, thyromental distance, neck circumference, ratio of height to thyromental distance and body mass index showing the best cutoff values and sensitivity and specificity of each individual assessment tool