Received: 23 January 2020
Revised: 21 April 2020
Accepted: 27 April 2020
First Online: 15 May 2020
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.
: The views expressed are those of the authors and do not necessarily represent the official position of the Office of Environmental Health Hazard Assessment, the California Environmental Protection Agency or the State of California, nor any of the U.S. Government (National Toxicology Program, U.S. Environmental Protection Agency, and the Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health) or International agencies (International Agency for Research on Cancer) with which some of the authors are affiliated.