University Health Network | 196,574 followers on LinkedIn. Canada's largest research hospital: Princess Margaret, Toronto General, Toronto Rehab, Toronto Western & Michener. | University Health Network (UHN) is Canada's largest research hospital, which includes Toronto General and Toronto Western Hospitals, Princess Margaret Cancer Centre, the Toronto Rehabilitation Institute and the Michener Institute for Education at UHN. The scope of research and complexity of cases at UHN has made it a national and international source for research, education and patient care. UHN is a research hospital affiliated with the University of Toronto, with major research in cardiology, transplantation, neurosciences, oncology, surgical innovation, infectious diseases, genomic medicine and rehabilitation medicine.