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Article History

Received: 14 September 2017

Revised: 5 December 2017

Accepted: 10 January 2018

First Online: 3 February 2018

Compliance with ethical standards

:

: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge, or beliefs) in the subject matter or materials discussed in this manuscript.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (CEI-R, Regional Research Ethics Committee of the Community of Madrid, Spain) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: Informed consent was obtained from all individual participants included in the study.