@article{articleb3a88d0d,
title   = {Aging reduces complexity of heart rate variability assessed by conditional entropy and symbolic analysis},
author = {Takahashi, Anielle Cristhine de Medeiros and Porta, Alberto and Melo, Ruth Caldeira de and Quitério, Robison J and Silva, Ester da and Borghi-Silva, Audrey and Tobaldini, Eleonora and Montano, Nicola and Catai, Aparecida Maria},
year = {2012},
doi = {10.1007/s11739-011-0512-z},
journal   = {Internal and Emergency Medicine}
}