1. Division of Pulmonary and Critical Care Medicine; Department of Medicine; David Geffen School of Medicine at UCLA; Los Angeles CA
2. Department of Biomathematics; University of California at Los Angeles; Los Angeles CA
3. Division of Infectious Diseases; Department of Medicine; David Geffen School of Medicine at UCLA; Los Angeles CA
4. Division of Cardiothoracic Surgery; Department of Surgery; David Geffen School of Medicine at UCLA; Los Angeles CA