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Many contributed to the preparation of this report, and we wish to acknowledge in particular the private companies, industry associations, research institutes, universities, and government agencies whose experts contributed data and insights underlying the analysis herein.

RTI International is one of the world's leading research institutes, dedicated to improving the human condition by turning knowledge into practice. Our staff of more than 4,150 provides research and technical services to governments and businesses in more than 75 countries in the areas of health and pharmaceuticals, education and training, surveys and statistics, advanced technology, international development, economic and social policy, energy and the environment, and laboratory testing and chemical analysis. For more information, visit www.rti.org. RTI International is a registered trademark and a trade name of Research Triangle Institute.

Many contributed to the preparation of this report, and we wish to acknowledge in particular the private companies, industry associations, research institutes, universities, and government agencies whose experts contributed data and insights underlying the analysis herein.