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Nurses and midwives comprise the largest professional group in most national health systems, so shortfalls in numbers can have a substantial impact on health care delivery. A scarcity of human resources in health has been internationally recognized and has led the International Council of Nurses to launch the Global Workforce Project in 2004, and the World Health Organization to announce the Health Workforce Decade 2006–15 in 2006. 1, 2 Efforts to address workforce needs through coherent workforce planning and policy setting are hampered by the complexity of predicting the supply of and demand for nurses and midwives, and the challenges associated with understanding drivers of workforce retention. 3 Available workforce descriptors among regulatory authorities vary considerably; and collections are mostly cross-sectional, frequently incomplete and typically limited to administrative databases. In …