Received: 8 January 2018
Accepted: 5 October 2018
First Online: 17 October 2018
Ethics approval and consent to participate
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008. Anonymity of personal data was guaranteed. All participants signed an informed consent form. For ethical reasons, all the participants in the control group received information about the principles of a healthy diet from their physicians. The study protocol was approved by the National Centre for the Prevention and Control of Disease (CCM).
: Not applicable.
: All authors declare that they have no competing interests.
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