[1] Memorial Sloan-Kettering Cancer Center,Health Outcomes Research Group, Department of Epidemiology and Biostatistics
[2] University of North Carolina at Chapel Hill,Department of Health Policy and Management, Gillings School of Global Public Health
[3] Harvard Medical School,Division of General Medicine, Brigham and Women's Hospital; Department of Health Care Policy, Harvard Medical School, Department of Health Care Policy
[4] University of North Carolina,Department of Health Behavior and Health Education, Gillings School of Global Public Health
[5] Institute for Clinical Evaluative Sciences,Health Services Research Program, Cancer Care Ontario and the Ontario Institute for Cancer Research
[6] Sunnybrook Health Sciences Centre,Center for Health Services Research
[7] Henry Ford Health System,Department of Medicine
[8] Durham VAMC,Department of Health Policy and Management, Gillings School of Global Public Health
[9] HSR&D Center of Excellence,Division of Gastroenterology and Hepatology
[10] Duke University Medical Center,undefined
[11] University of North Carolina at Chapel Hill,undefined
[12] University of North Carolina,undefined