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Send nominations to the editor at [email protected]. The journal uses the American Psychological Association’s format (7th edition) for bibliographic citations. Explanatory material will be presented ...

Arctic sea ice extent through most of April changed very little. Only at the end of the month did extent begin to decline. Because the month started with unusually low extent, however, the average ...

1 Department of Biomedical Informatics, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA 2 Division of Geriatric Medicine, Department of Medicine, University of Pittsburgh, ...