Assessment of Pulse Wave Pressure Changes for Detection of Arrhythmia and Comorbidities Using a Wrist-Worn Wearable Device Reading time: < 1 min ← An Overview of the Feasibility of Permanent, Real-Time, Unobtrusive Stress Measurement with Current Wearables → Usability of a Wrist-Worn Smartwatch in a Direct-to-Participant Randomized Pragmatic Clinical Trial