N. C. Smeeton, D. G. Wilkinson, M. Gomez Beneyto, V. Llopis, A Tale of Two Cities: Repetition of Parasuicide in Edinburgh (Scotland) and Valencia (Spain), Journal of the Royal Statistical Society. Series D (The Statistician), Vol. 39, No. 4 (1990), pp. 365-371
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Smeeton et al. (1990) studied this question.
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