Fernández, P.
Regenjo, M.
Ares, A.
Fernández, A. M.
Lorenzo, R. A.
Carro, A. M.
Article History
Received: 26 July 2018
Revised: 9 September 2018
Accepted: 10 October 2018
First Online: 25 October 2018
Compliance with ethical standards
: This study has been carried out using oral fluid samples from healthy volunteers and patients participating in substitution therapy programs, authorized by the Comité Autonómico de Ética da Investigación de Galicia Consellería de Sanidade. Xunta de Galicia (SPAIN), with the reference 2015/488, according to Spanish Regulation Law 14/2007, of biomedical investigation and the Real Decreto 1716/2011, of November 18. All the samples have been provided by volunteers and patients who did not oppose to the use of these samples for the development of an analytical method and signed the corresponding informed consent.
: All authors declare that they have no conflict of interest.