Funding for this research was provided by:
Ministerio de Economía y Competitividad (PSI2015-66755-R)
Received: 12 March 2018
Accepted: 21 September 2018
First Online: 29 September 2018
Change Date: 31 May 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: This is a review of published studies. No ethical approval was necessary, but all included studies were conducted with ethical approval and consent.
: Not applicable.
: The authors declare that they have no competing interests.
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