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Authors
Santos-Silva, Rita
Fontoura, Manuel
Guimarães, João T.
Barros, Henrique
Santos, Ana Cristina
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Article History
Received: 26 March 2021
Revised: 26 July 2021
Accepted: 8 August 2021
First Online: 20 August 2021
Competing interests
: The authors declare no competing interests.
: All the phases of the study complied with the Ethical Principles for Medical Research Involving Human Subjects expressed in the Declaration of Helsinki. The study was approved by the University of Porto Medical School/S. João Hospital Centre ethics committee and parents or legal representatives of the children signed informed consent at the baseline and all the subsequent follow-up evaluations. Children gave their oral assent in all phases of the study.
