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Xu, Xiaomeng; Tupy, Samantha; Robertson, Stephen; Miller, Ashley L.; Correll, Danielle; Tivis, Rick; Nigg, Claudio R. (2018). Successful adherence and retention to daily monitoring of physical activity: Lessons learned. PLoS ONE, 13(9) Public Library of Science 10.1371/journal.pone.0199838
