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Article History

Received: 13 February 2021

Accepted: 5 April 2021

First Online: 4 May 2021

Declarations

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: The authors declare that: (a) they have no financial or personal relationship, present or past, which could bias or inadequately influence the making of this work; (b) they have not and will not receive any financial compensation for the study design, data collection or analysis, manuscript preparation or submission for publication.

: This study was designed according to the basic principles of the Declaration of Helsinki of the World Medical Association [CitationRef removed]. The highest levels of professionalism and confidentiality were applied and the national regulations for data protection were observed. Participants’ right to confidentiality was granted and their identities were coded. Only authorized staff had access to identification-related personal information for data verification purposes. This research project was approved by the Ethics Committee for Clinical Research of the Mother and Child University Hospital of the Canary Islands (Complejo Hospitalario Universitario Insular-Materno Infantil de Canarias; Id: CEIm-CHUIMI-2016/883). Trainees participated voluntarily and anonymously, and they agreed to results publication.

: All participants (operators and patients collected data) were asked to sign informed consent.