Funding for this research was provided by:
Fundación para el Fomento en Asturias de la Investigación Científica Aplicada y la Tecnología (No.3502Z20164055)
Received: 23 October 2019
Accepted: 8 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: The study conforms to the ethical standards of the Helsinki declaration and approval was obtained from the institutional ethics committee.
: Consent was obtained from the patients’ relatives.
: The authors declare that they have no competing interests.