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Valentijn, S. A. M., Hooren, S. A. H., Bosma, H., Touw, D. M., Jolles, J., Van Boxtel, M. P. J., et al. (2005). The effect of two types of memory training on subjective and objective memory performance in healthy individuals aged 55 years and older: A randomized controlled trial. Patiente Education and Counseling, 57(1), 106-114.