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Bjurstam, Nils; Bjorneld, Lena; Duffy, Stephen W.; Smith, Teresa C.; Cahlin, Erling; Eriksson, Olof; Hafstrom, Lars-Olof; Lingaas, Halvard; Mattsson, Jan; Persson, Stellan; Rudenstam, Carl-Magnus; Save-Soderbergh, Johan Author Information
Bjurstam et al. (Sun,) studied this question.