Harvard Chan Microbiome in Public Health Center, Harvard T. H. Chan School of Public Health, Boston, MA, USA. Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA. Department of Biostatistics, Harvard T. H. Chan School of Public Health, Boston, MA, USA. Clinical and Translational Epidemiology Unit, Mongan Institute, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA. South Australian Health and Medical Research Institute, Infection and Immunity Theme, School of Medicine, Flinders University, Adelaide, Australia. Department of Nutrition and Dietetics, College of Nursing and Health Sciences, Flinders University, Adelaide, South Australia, Australia. Food Science and Technology Department, Institute of Agriculture and Natural Resources, University of Nebraska, Lincoln, NE, USA. Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska, USA. Department of Public Health, Zuckerberg College of Health Sciences, University of Massachusetts Lowell, Lowell, MA, USA. Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA. Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL, USA. Broad Institute of Harvard and MIT, Cambridge, MA, USA. Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, MA, USA. Department of Molecular Metabolism, Harvard T. H. Chan School of Public Health, Boston, MA, USA. Department of Medicine, Harvard Medical School, Boston, MA, USA. Department of Medical Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA, USA. Harvard Chan Microbiome in Public Health Center, Harvard T. H. Chan School of Public Health, Boston, MA, USA. mingyangsong@mail.harvard.edu. Clinical and Translational Epidemiology Unit, Mongan Institute, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. mingyangsong@mail.harvard.edu. Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. mingyangsong@mail.harvard.edu. Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA. mingyangsong@mail.harvard.edu. Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA. mingyangsong@mail.harvard.edu.