Anatomic landmark versus ultrasound approach to crycothyroidotomy: The author responds

The CTM was defined as a surface, but the operators used a point estimate with a board marker; the details of this are mentioned in the 'Methods' section of the manuscript [2]. [...]the risk of bias was reduced in our study, but in certain similar previous studies trying to identify the CTM with ultrasound (US), some of the participants were both operators and models [4], whereas in others, the operators directly decided the proper position of the CTM without a control mechanism [3].