Fixed Versus Lottery Incentives for Promoting Engagement With a Cadence-Based Smartphone App: Randomized Crossover Trial

Kosuke Hayashi   ^{1, 2} , MD, PhD ;   Hiromitsu Imai   ³ , MD, PhD ;   Ichiro Oikawa   ⁴ , PharmD ;   Hirokazu Wakuda   ⁴ , PhD ;   Iori Miura   ⁵ , ME ;   Shingo Uenohara   ⁵ , BS ;   Asuka Kuwae   ⁵ , BEc ;   Megumi Kai   ¹ , MD, PhD ;   Ken'ichi Furuya   ⁵ , PhD ;   Naoto Uemura   ¹ , MD, PhD

¹ Department of Clinical Pharmacology and Therapeutics, Faculty of Medicine, Oita University, Yufu, Japan

² Department of Cardiology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Aichi, Japan

³ Department of Medical Ethics, Faculty of Medicine, Oita University, Yufu, Japan

⁴ Clinical Pharmacology Center, Oita University Hospital, Yufu, Japan

⁵ Faculty of Science and Technology, Oita University, Oita, Japan