[IEEE 2020 Ural Symposium on Biomedical Engineering, Radioelectronics and Information Technology (USBEREIT) - Yekaterinburg, Russia (2020.5.14-2020.5.15)] 2020 Ural Symposium on Biomedical Engineering, Radioelectronics and Information Technology (USBEREIT) - Effects of Lead Position, Cardiac Rhythm Variation and Drug-induced QT Prolongation on Performance of Machine Learning Methods for ECG Processing