1 Department of Medicine (Ladha); Division of Hematology (Khalife), Department of Medicine; Division of Infectious Diseases (Purssell), Department of Medicine, The Ottawa Hospital, University of Ottawa; Division of Infectious Diseases (Hummel), Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, Ont.
2 Department of Medicine (Ladha); Division of Hematology (Khalife), Department of Medicine; Division of Infectious Diseases (Purssell), Department of Medicine, The Ottawa Hospital, University of Ottawa; Division of Infectious Diseases (Hummel), Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, Ont. apurssell@toh.ca.