Cognitive function changes in older people. Results of second wave of Cognition of Older People, Education, Recreational Activities, NutritIon, Comorbidities, fUnctional Capacity S... by Kujawski, S, Kujawska, A, Perkowski, R, Androsiuk-Perkowska, J, Hajec, W, Kwiatkowska, M, Skierkowska, N, Husejko, J, Bieniek, D, Newton, JL, Morten, KJ, Zalewski, P, Kędziora-Kornatowska, K