1. Division of Infectious Diseases; Brigham & Women's Hospital; Harvard Medical School; Boston; Massachusetts; USA
2. Division of Infectious Diseases and Geographic Medicine and Center for Primary Care and Outcomes Research; Stanford University School of Medicine; Stanford; California; USA
3. Department of Radiology; Brigham and Woman's Hospital; Harvard Medical School; Boston; Massachusetts; USA
4. Division of Pulmonary and Critical Care Medicine; Brigham & Women's Hospital; Harvard Medical School; Boston; Massachusetts; USA