2020 and 2021 Challenges are complete

Both the 2020 Challenge and the 2021 Challenge, which extended the 2020 Challenge, are now complete. The CinC articles for both Challenges are available on the CinC website here and here. The final scores can be found here. Please cite Perez Alday EA, Gu A, J Shah A, Robichaux C, Ian Wong AK, Liu C, Liu F, Bahrami Rad A, Elola A, Seyedi S, Li Q, Sharma A, Clifford GD^* Reyna MA^*. Classification of 12-lead ECGs: The PhysioNet/Computing in Cardiology Challenge 2020. Physiol. Meas. 2021 Jan 1;41(12):124003. doi: 10.1088/1361-6579/abc960 to refer to the 2020 Challenge. Please also cite the standard PhysioNet citation. You can find followup articles to the 2020 Challenge in the 2021 Challenge and in the Journal of Physiological Measurement Focus Issue on Classification of Multilead ECGs.