[1] Publ Hlth England PHE Dicot, Ctr Radiat Chem & Environm Hazards CRCE, Radiat Effects Dept, Cellular Biol Grp, Chilton OX11 0RQ, Oxon, England
[2] Univ Calif Los Angeles, David Geffen Sch Med, Dept Human Genet, Los Angeles, CA 90095 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Dept Biostat, Los Angeles, CA 90095 USA
[4] Elizabeth House Med Practice, Warlingham CR6 9LF, Surrey, England