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ACHESON RM. Observer error and variation in the interpretation of electrocardiograms in an epidemiological study of coronary heart disease. Br J Prev Soc Med. 1960 Jul;14:99–122.[PMC free article][PubMed]
LUDBROOK J, CLARKE AM, McKENZIE JK. Significance of absent ankle pulse. Br Med J. 1962 Jun 23;1(5294):1724–1726.[PMC free article][PubMed]
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