1. Department of Population Sciences, Beckman Research Institute, City of Hope, Duarte, California, USA
2. School of Community and Global Health, Claremont Graduate University, Claremont, California, USA
3. Department of Cancer Biology, Beckman Research Institute, City of Hope, Duarte, California, USA
4. Smoking Cessation Program, Medical Center, City of Hope, Duarte, California, USA
5. Department of Geography, San Diego State University, San Diego, California, USA