@Patrick_Ryan so is now the time to reveal my cryptographic blockchain data linkage of apple watch data to OHDSI datasets? I’m kidding but seriously the future of RWD being able to compare claims, EHR, extraction of a rhythm strip, to PRO data will undoubtedly improve and complicate our phenotype development. I think it’s still too soon for Dr. Apple to bill an I48 but watch this space as RWD evolves. Accuracy of Detecting Atrial Fibrillation: A Systematic Review and Meta-Analysis of Wrist-Worn Wearable Technology - PubMed