Alvarez-SanNicolas, J. http://orcid.org/0000-0002-0014-3234
Gracia-Alegria, I.
Trullols-Tarrago, L.
Peiro-Ibañez, A.
Lamas-Gomez, C.
Article History
Received: 22 October 2018
Accepted: 15 February 2019
First Online: 23 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This is a retrospective cohort study, so for this type of study formal consent is not required.