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1by Heikkinen, E., Seppänen, B., Rimpelä, M.Get access
Published in Scandinavian Journal of Social Medicine (1975)
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2by Nyström, S. H. M., Rönty, H. S., Heikkinen, E. R., Heiskari, M. J., Laitinen, J., Tulkki, K. K. -J.Get access
Published in Neurosurgical Review (1981)
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