Structured approach to ultrasound-guided identification of the cricothyroid membrane: a randomized comparison with the palpation method in the morbidly obese von Kristensen, M.S., Teoh, W.H., Rudolph, S.S., Tvede, M.F., Hesselfeldt, R., Børglum, J., Lohse, T., Hansen, L.N.

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