Hippocampal maintenance after a 12-month physical activity intervention in older adults: The REACT MRI study oleh Naiara Demnitz, Afroditi Stathi, Janet Withall, Candida Stainer, Poppy Seager, Jolanthe De Koning, Patrick Esser, Thomas Wassenaar, Helen Dawes, Jonathan Brooks, Klaus P. Ebmeier, Heidi Johansen-Berg, Claire E. Sexton