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Statistics and Probability Letters > 2012 > 82 > 4 > 859-863
European Journal of Epidemiology > 1997 > 13 > 5 > 491-502
Statistics and Probability Letters > 2012 > 82 > 4 > 859-863
European Journal of Epidemiology > 1997 > 13 > 5 > 491-502