Linear and nonlinear analysis of heart rate variability in essential hypertensive patientsGerardo Rojas-Vite, Valeria García-Muñoz, Erika E. Rodríguez-Torres and Erik L. Mateos-SalgadoEur. Phys. J. Spec. Top., (2021) 1-9DOI: https://doi.org/10.1140/epjs/s11734-021-00312-9