White Matter Lesions and Cognitive Performance: The Role of Cognitively Complex Leisure Activity..

Jane S Saczynski,  Maria K Jonsdottir,  Sigurdur Sigurdsson, Gudny Eiriksdottir,  Palmi V Jonsson, Melisa E Garcia, Olafur Kjartansson, Mark A van Buchem, MD, Vilmundur Gudnason,  Lenore J Launer.  J Gerontol A Biol Sci Med Sci. 2008 Aug;63(8):848-54