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c Disorders 17, no. I (Jan 1993): 21-23. 222 EFTA00810224 Notes 16 Gemot Ernst, Heart Rate Variability (London: Springer-Verlag, 2014), 261. 17 Stephen W. Porges, "Orienting in a Defensive World: Mammalian Modifications of our Evolutionary Heritage—A Polyvagal Theory," Psychophysiology32 (1995): 301-18. 18