Funding for this research was provided by:
“la Caixa” Foundation
Fondo de Investigación Sanitaria (PI12/00326)
Secretaría de Estado de Investigación, Desarrollo e Innovación (RYC-2013- 13054)
Received: 16 January 2018
Accepted: 24 April 2018
First Online: 24 May 2018
Ethics approval and consent to participate
: The study was approved by the local ethics committee, and all individuals gave written informed consent to participate.
: The authors declare that they have no competing interests.
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