1. Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
2. Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA
3. Department of Pathology and Surgery, University of Alabama at Birmingham, Birmingham, AL 35294, USA
4. Biostatistics Department, University of Alabama at Birmingham, Birmingham, AL 35294, USA
5. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI 48824, USA
6. Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI 48824, USA