Saltos Rosero, Nancy http://orcid.org/0000-0002-9506-6496
Seoane Prado, Rafael
Aguilera Guirao, Antonio
Santos, Ysabel http://orcid.org/0000-0003-4398-4102
Article History
Received: 22 November 2019
Revised: 15 April 2020
Accepted: 14 May 2020
First Online: 22 May 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All volunteers signed a written informed consent approved by the Bioethics Committee of the Universidade de Santiago de Compostela. Each questionnaire and saliva sample obtained in this study was identified by a number, so that it could not be associated with any person.