Amy B Davis, James A Gaudino1, Colin L Soskolne2, Wael K Al-Delaimy3. 1. School of Public Health, Oregon Health & Sciences University and Portland State University (SPH OHSU-PSU), 840 SW Gaines St #230, Portland, OR 97239, USA. 2. University of Alberta School of Public Health, 3-300 Edmonton Clinic Health Academy, 11405-87 Ave, Edmonton, AB T6G 1C9, Canada. 3. Department of Family Medicine and Public Health, University of California, San Diego, La Jolla, CA 92093-0628, USA.