Article History
Received: 28 April 2020
Revised: 21 July 2020
Accepted: 27 July 2020
First Online: 8 September 2020
Compliance with Ethical Standards
:
: The authors declare they have no competing interests.
: Ethical approval was not necessary due to the nature of the review article.
: Individual information was not used in this review, and, therefore, informed consent is not necessary.
: Not applicable.
: Not applicable.
: The opinions expressed in this article are those of the authors and do not represent those of the California Environmental Protection Agency or the Office of Environmental Health Hazard Assessment.