Text and Data Mining valid from 2019-07-19
Received: 6 February 2019
Revised: 18 June 2019
Accepted: 19 June 2019
First Online: 19 July 2019
Compliance with ethical standards
: The study was conducted in accordance with the Declaration of Helsinki (7th revision), the Spanish regulations on observational studies (Order SAS 3470/2009), and Spanish personal data protection law (Law 15/ 1999). The study protocol was approved by the Ethics Committee of A Coruña, Spain. Parents or legal representatives of all patients gave written informed consent before inclusion, and patients over 12 years old also signed informed assent. All data were anonymized.
: The authors declare that they have no conflict of interest.