1. Los Alamos National Laboratory (LANL), Radiation Protection Division, Los Alamos, New Mexico 87545
2. Unaffiliated (retired from Los Alamos National Laboratory), Santa Fe, New Mexico
3. Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Direction de la Recherche Fondamentale, Institut de Biologie François Jacob, Université Paris-Saclay, Fontenay-aux-Roses, France
4. L Bertelli and Associates, Salt Lake City, Utah