Fig. 1: Selection and assignment of study population. List of Montreal general practitioners provided by the Collège des médecins du Québec. Random assignment was within strata defined by physician age (34–44, 45–48, 49–68 years), language (French, English), sex, number of elderly patients (< 118, ≥ 118) and location of medical school of graduation (foreign, Canada or the United States). CDS = computerized decision-making support.