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US2015366469A1   [0015]  [0015] 
CN106028272   [0016] 
US5040539A   [0017] 
US4960126A   [0017] 

Wrist-Located Optical Device for Atrial Fibrillation Screening: A Clinical Study on Twenty Patients   [0008] 
Can one detect atrial fibrillation using a wrist-type photoplethysmographic device?   [0009]