Received: 21 February 2018
Accepted: 23 November 2018
First Online: 5 December 2018
Ethics approval and consent to participate
: The survey protocol ENSANUT was approved by the Ethics, Research and Biosafety Committees of the INSP (E&RC: 1033, No. 1108; BC: 1024). All adult participants (≥ 18 years) signed a letter of informed consent. Specific protocol was extent of approval since data was secondary to ENSANUT (E&RC: 889).
: All authors declare that they have no competing interests.
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