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Schoenenberger, A W; Erne, P; Ammann, S; Perrig, M; Bürgi, U; Stuck, A E (2008). Prediction of hypertensive crisis based on average, variability and approximate entropy of 24-h ambulatory blood pressure monitoring. Journal of human hypertension, 22(1), pp. 32-7. London: Nature Publishing Group 10.1038/sj.jhh.1002263