1. Health Canada; Ottawa Ontario Canada
2. St Michael's Hospital; Li Ka Shing Knowledge Institute; Toronto Ontario Canada
3. Royal College of Physicians and Surgeons of Canada; Centre for Learning in Practice; 774 Echo Drive Ottawa Ontario Canada K1S5N8
4. University of Toronto; Dept of Biostatistics; Toronto Ontario Canada
5. Ottawa Hospital Research Institute; Box 208, 501 Smyth Road Ottawa Ontario Canada K1H 8L6