The environment of medicine in the 21st century: implications for preventive and community approaches.
D002170:Canada; D003153:Community Health Services / Q000639:trends*; D003695:Delivery of Health Care; D005544:Forecasting; D006784:Hospitals, Teaching; D006801:Humans; D010819:Physician's Role; D011315:Preventive Medicine / Q000639:trends*; D011322:Primary Prevention / Q000639:trends