1 Health Protection, Public Health Ontario, Toronto, Ontario, Canada; Hotel Dieu Shaver Health and Rehabilitation Centre, Pharmacy Department, St. Catharines, Ontario, Canada. Electronic address: brad.langford@gmail.com.
2 Sinai Health-University Health Network Antimicrobial Stewardship Program, University Health Network, Toronto, Ontario, Canada; Leslie Dan Faculty of Pharmacy, University of Toronto, Ontario, Canada; Toronto General Hospital Research Institute, Toronto, Ontario, Canada.
3 Health Protection, Public Health Ontario, Toronto, Ontario, Canada; Toronto East Health Network, Pharmacy Department, Michael Garron Hospital, Toronto, Ontario, Canada.
4 North York General Hospital, Pharmacy Department, North York, Ontario, Canada.
5 Pharmacy Department, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.
6 Toronto East Health Network, Pharmacy Department, Michael Garron Hospital, Toronto, Ontario, Canada.
7 Leslie Dan Faculty of Pharmacy, University of Toronto, Ontario, Canada.
8 Health Protection, Public Health Ontario, Toronto, Ontario, Canada; Division of Epidemiology, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada; Sunnybrook Research Institute, Toronto, Ontario, Canada; Division of Infectious Diseases, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada; Institute of Health Policy, Management and Evaluation, University of Toronto, Ontario, Canada.
9 ICES (formerly Institute for Clinical Evaluative Sciences), Toronto, Ontario, Canada.
10 Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.