Heart rate variability and systemic hemodynamic state in adults with a first time, non-traumatic epileptic seizure during an orthoclinostatic stress test - O. V. Grebenyuk; V. M. Alifirova; M. V. Svetlik; N. G. Kataeva; V. N. Vasilyev (Бюллетень сибирской медицины, 2020)