Widén, L; Blomqvist, G.; DePaulis, T.; Ehrin, E.; Eriksson, L; Farde, L; Greitz, T.; Hedström, C. G.; Ingvar, D. H.; Litton, J. E.; Nilsson, J. LG.; Ögren, S. O.; Sedvall, G.; Stone-Slander, S.; Wiesel, F. -A.; Wik, G. Author Information
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Widén et al. (1984) studied this question.