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Beirness DJ, Simpson HM, Mayhew DR, Wilson RJ.Beirness DJ, et al. Among authors: simpson hm.Can J Public Health. 1994 Jan-Feb;85(1):19-22.Can J Public Health. 1994.PMID: 8180918
Mayhew DR, Simpson HM, Williams AF, Ferguson SA.Mayhew DR, et al. Among authors: simpson hm.J Public Health Policy. 1998;19(1):51-67.J Public Health Policy. 1998.PMID: 9581430Review.