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Demand for locum tenens physicians in family practices increased dramatically between 2004 and 2005, by more than 50,000 days requested, indicating a significant shift in the specialties most sought after for temporary positions, according to the Staff Care, Inc., 2006 Review of Temporary Physician Staffing Trends. In 2004, anesthesiologists and certified registered nurse anesthetists (CRNA)-representing 32% of all assignments with a combined 64,105 days requested-topped Staff Care's list of specialties in greatest demand.