Comparison of the R-R intervals in ECG and Oximeter signals to be used in complexity measures of Natural Time Analysis. - Giorgos Baldoumas; Dimitrios Peschos; Georgios Tatsis; Constantinos I. Votis; Spyridon K. Chronopoulos; Vasilis Christofilakis; Panos Kostarakis; Nicholas V. Sarlis; Efthimios S. Skordas; K. K. Naka; A. Bechlioullis (MOCAST, 2018)