During his PhD, Paul van Gent decided this, according to this source: https://www.linkedin.com/posts/paul-van-gent-3b5b5817_tudelft-hearthealth-nato-activity-6973582273610665985-J7WD/?trk=public_profile_like_view&originalSubdomain=ch Did Paul van Gent open source HeartPy, because he did see, that PPG devices will never be as accurate as 3 lead ECG gold standard fro HRM measurement devices? We do not know. But if this is true, Rob ter Horst can …