App-assured essential physical activity for the prevention of cognitive decline: changing paradigms in public health – a study protocol for a randomised controlled trial: A study protocol of the PA PROTECT study (M. Jamka, A. Makarewicz, M. Wasiewicz-Gajdzis, J. Brylak, H. Wielińska-Wiśniewska, Z. Pawlak, J. K. Nowak, K.-H. Herzig, E. Mądry, & J. Walkowiak , Trans.). (2021). Journal of Medical Science, 90(4), e530. https://doi.org/10.20883/medical.e530