Funding for this research was provided by:
Ministerio de Economía, Industria y Competitividad, Gobierno de España (PSI2015-68659-P)
Text and Data Mining valid from 2019-10-29
Received: 17 December 2018
Accepted: 9 October 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: This study was approved by the Clinical Research Ethics Committee of Junta de Andalucía (Spain) and the principles of the World Medical Association (Declaration of Helsinki) were guaranteed. Parents and guardians signed a written informed consent authorizing participation of the children in the study.
: “Not applicable”.
: The authors declare that they have no competing interests.