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Vonk Noordegraaf A, Kunst PW, Janse A, Marcus JT, Postmus PE, Faes TJ, de Vries PM.Vonk Noordegraaf A, et al. Among authors: postmus pe.Physiol Meas. 1998 May;19(2):263-73. doi: 10.1088/0967-3334/19/2/013.Physiol Meas. 1998.PMID: 9626690