To back up their opposition, doctors across Canada began to opt out of their provincial plans. In Ontario, approximately 20 per cent of doctors had left the Ontario Health Insurance Plan (OHIP) by 1982, and in Peterborough, for example, 100 per cent of the doctors had opted out. Doctors in Alberta were particularly militant and, by 1982, 44 per cent had opted out and many were also extra-billing patients, including the elderly and those on social assistance. Conflict between the medical profession and provincial governments led to job action. On May 13, 1981, all but three of the 100 doctors in Kamloops, British Columbia stopped work. In April and May 1982, doctors in Ontario and Quebec started rotating strikes, and those in Quebec were legislated back to work by the Parti Québécois government.