Funding for this research was provided by:
Valdecilla Health Research Institute (IDIVAL). (19th call for research)
Received: 23 April 2020
Accepted: 2 September 2020
First Online: 9 September 2020
Ethics approval and consent to participate
: This project was approved by the Ethics Committee for Clinical Research of Cantabria on July, 2017, reference number 2017.142. The parents signed an informed consent for participating in the study. The project was carried out according to the Spanish laws on biomedical research, the European Union regulations on the protection of natural persons with regard to the processing of personal data and the Declaration of Helsinki on ethical principles for medical research involving human subjects.
: The authors declare no conflict of interest.