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Direct Measurement of Brain Glucose Concentrations in Humans by13C NMR SpectroscopyRolf Gruetter, Edward J. Novotny, Susan D. Boulware, Douglas L. Rothman, Graeme F. Mason, Gerald I. Shulman, Robert G. Shulman and William V. Tamborlane · Proceedings of the National Academy of Sciences of the United States of America · 1992