New York University School of Medicine, New York, NY [email protected]

US Department of Energy, New York, NY (retired)

National Council on Radiation, Protection and Measurements, Bethesda, MD and Vanderbilt University, Nashville, TN

Radian Scientific, Huntsville, AL

Fred Hutchinson Cancer Research Center, Seattle, WA

Cascade Scientific, Bend, OR

University of New Mexico, Albuquerque, NM

US Environmental Protection Agency, Research Triangle Park, NC

Risk Assessment Corporation, Neeses, SC

University of Manchester, Manchester, UK

University of Zurich, Zurich, Switzerland

Memorial Sloan Kettering Cancer, Center New York, NY

The authors declare no conflicts of interest.

(Manuscript accepted 21 March 2019)