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. 2015 Oct 5;2015:386080. doi: 10.1155/2015/386080

(a) Initial cuff pressure 15 cmH2O

  Flexion Extension Rotation
HVLP 5.3 [3.9–7.7] 3.4 [2.4–4.2] 0.3 [−0.8–1.1]
Taper 2.6 [1.5–3.5] 0.2 [−0.2–0.4] 0.1 [−0.7–0.6]
P value <0.001∗ <0.001∗ 0.41