Authors: P A McKinney; B E Roberts; C O'Brien; C C Bird; I D Richards; F Alexander; R A Cartwright Journal: Acta Haematol Date: 1990 Impact factor: 2.195
Authors: K E Malone; T D Koepsell; J R Daling; N S Weiss; P D Morris; J W Taylor; G M Swanson; J L Lyon Journal: Am J Epidemiol Date: 1989-12 Impact factor: 4.897