Entropy Measures in the Assessment of Heart Rate Variability in Patients with Cardiodepressive Vasovagal Syncope. - Beata Graff; Grzegorz Graff; Danuta Makowiec; Agnieszka Kaczkowska; Dorota Wejer; Szymon Budrejko; Dariusz Kozlowski; Krzysztof Narkiewicz (Entropy, 2015)