Investigating Rewards and Deposit Contract Financial Incentives for Physical Activity Behavior Change Using a Smartphone App: Randomized Controlled Trial by David R de Buisonjé, Thomas Reijnders, Talia R Cohen Rodrigues, Santhanam Prabhakaran, Tobias Kowatsch, Stefan A Lipman, Tammo H A Bijmolt, Linda D Breeman, Veronica R Janssen, Roderik A Kraaijenhagen, Hareld M C Kemps, Andrea W M Evers

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