Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts. Clinical Epidemiology Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden. Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, Florida. Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts. Department of Oncologic Pathology, Dana-Farber Cancer Institute, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts. Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts. Departments of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, Massachusetts. Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, Massachusetts. Department of Oncologic Pathology, Dana-Farber Cancer Institute, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts. massimo_loda@dfci.harvard.edu.