Oxford University Press, International Journal of Epidemiology, 4(20), p. 1142-1143, 1991
DOI: 10.1093/ije/20.4.1142
Oxford University Press, International Journal of Epidemiology, 4(20), p. 1140-1141, 1991
DOI: 10.1093/ije/20.4.1140
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