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Billström A, Hietala SO, Sunnegårdh O, Sjödin JG, Wirell S.Billström A, et al. Among authors: wirell s.Acta Radiol. 1990 Sep;31(5):509-11.Acta Radiol. 1990.PMID: 2261301Clinical Trial.
Billström A, Hietala SO, Lithner F, Merikanto J, Wirell M, Wirell S.Billström A, et al. Among authors: wirell m, wirell s.Acta Radiol. 1989 Sep-Oct;30(5):509-15.Acta Radiol. 1989.PMID: 2692666Clinical Trial.