Funding for this research was provided by:
National Institute of Environmental Health Sciences (R21ES024356, 2R01ES010544, U54ES012078)
Received: 17 December 2020
Accepted: 7 March 2021
First Online: 22 March 2021
: The PEG study was approved by the UCLA Institutional Review Board (IRB# 11-001530) and informed consent was obtained from all individuals. Our research conformed to the Declaration of Helsinki.
: Not applicable, this manuscript does not contain any individual person’s data in any form, e.g. individual details, images, or videos.
: The authors declare that they have no competing interests.