Received: 19 September 2017
Accepted: 30 April 2019
First Online: 28 May 2019
Ethics approval and consent to participate
: The research has been approved by the local ethics committee, from the ‘Príncipe de Asturias’ University Hospital (date 12/1/2004). All participants have signed a consent form specifically design for current study.
: Not applicable.
: The authors declare that they have no competing interests.
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