Detection of Atrial Fibrillation Using a Ring-Type Wearable Device (CardioTracker) and Deep Learning Analysis of Photoplethysmography Signals: Prospective Observational Proof-of-Concept Study. - Kwon, Soonil; Hong, Joonki; Choi, Eue-Keun; Lee, Byunghwan; Baik, Changhyun; Lee, Euijae; Jeong, Eui-Rim; Koo, Bon-Kwon; Oh, Seil; Yi, Yung (Journal of Medical Internet Research, 2020)