A combined deficiency of vitamins E and C causes severe central nervous system damage in guinea pigs. - Burk, Raymond F.; Christensen, Joani M.; Maguire, Mark J.; Austin, Lori M.; Whetsell Jr., William O.; May, James M.; Hill, Kristina E.; Ebner, Ford F.; Whetsell, William O Jr (Journal of Nutrition, 2006)