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Letter in Physical Review Letters
Letter in Critical Care Medicine
Letter in BMJ
Letter in Proceedings of the National Academy of Sciences of the United States of America
Letter in British medical journal
Letter in Perspectives on Medical Education
Letter in Biological Conservation
Letter in American Heart Journal
Letter in IEEE Communications Letters
Letter in Trends in Ecology and Evolution
Letter in Obesity reviews
Letter in Journal of studies on alcohol and drugs
Letter in Journal of optometry
Letter in Health Policy