Funding for this research was provided by:
Ministerio de Ciencia y Tecnología (RTI 2018-102032-B-100)
Received: 25 March 2020
Accepted: 24 May 2020
First Online: 11 June 2020
Compliance with Ethical Standards
: All saliva donors signed an informed consent form and the protocol was approved by the Ethics Committee of the Valencian Public Health Authority (FISABIO-DGSP).
: The authors declare that they have no conflict of interest.