Prescott Jennifer, Ma Huiyan, Bernstein Leslie, Ursin Giske
Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA.
Cancer Epidemiol Biomarkers Prev. 2007 Mar;16(3):620-2. doi: 10.1158/1055-9965.EPI-06-0873.