Strategies to improve effectiveness of physical activity coaching systems: Development of personas for providing tailored feedback. - Reinoud Achterkamp; Marit Dekker-van Weering; Richard M. H. Evering; Monique Tabak; Josien G. Timmerman; Hermie J. Hermens; Miriam M. R. Vollenbroek-Hutten (Health Informatics J., 2018)