Received: 23 January 2020
Accepted: 16 June 2020
First Online: 23 June 2020
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving research study participants were approved by the US National Institutes of Health. Written informed consent was obtained from all subjects/patients. The National Children’s’ Study was authorized by the Children’s Health Act of 2000. Participants gave written consent.
: Authors provide consent for publication.
: Authors declare no conflicts of interest.