1 Department of General Practice, Melbourne Medical School, Melbourne, Victoria, Australia; Cancer in Primary Care Research Group, Primary Care Collaborative Cancer Clinical Trials Group (PC4), Center for Cancer Research, Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Melbourne, Victoria, Australia; Victorian Comprehensive Cancer Centre, Melbourne, Victoria, Australia.
2 Department of Epidemiology, College of Public Health, University of Nebraska Medical Center, Omaha, Nebraska.
3 Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Department of Critical Care Medicine, The First Affiliated Hospital of Guangzhou Medical University, State Key Laboratory of Respiratory Diseases, National Clinical Research Center for Respiratory Disease, Guangzhou Institute for Respiratory Health, Guangzhou, Guangdong, China.