1. Department of Epidemiology and Biostatistics, Texas A&M University, College Station Texas, U.S.A.
2. Department of Statistics, Texas A&M University College Station, Texas, U.S.A.
3. Department of Veterinary Medicine and Biomedical Sciences, Texas A&M University Texas, U.S.A.
4. The University of Texas MD Anderson Cancer Center 1515 Holcombe Blvd, Houston, Texas, U.S.A.
5. Program in Integrative Nutrition and Complex Diseases, Texas A&M University Texas, U.S.A.
6. Department of Epidemiology, University of Washington and the Fred Hutchinson Cancer Research Center Seattle Washington, U.S.A.