%0 Journal Article %T The GH/IGF-I Axis and Cognitive Changes across a 4-Year Period in Healthy Adults %A Jan Berend Deijen %A Lucia I. Arwert %A Madeleine L. Drent %J ISRN Endocrinology %D 2011 %I Hindawi Publishing Corporation %R 10.5402/2011/249421 %U http://dx.doi.org/10.5402/2011/249421