Investigation of the Minimum Conditions for Reliable Estimation of Clinically Relevant HRV Measures - Introducing a Novel Approach to the Validation of HRV Measurement Systems Topics: Risk Stratification Markers (Heart Rate Variability, Heart Rate Turbulence, Etc) In Proceedings of the 3rd International Congress on Cardiovascular Technologies CARDIOTECHNIX - Volume 1, 30-38, 2015 , Lisbon, Portugal