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Lang DM, Simon RA, Mathison DA, Timms RM, Stevenson DD.Lang DM, et al. Among authors: mathison da.Ann Allergy. 1991 Sep;67(3):324-30.Ann Allergy. 1991.PMID: 1897810
Mathison DA, Stevenson DD, Simon RA.Mathison DA, et al.Chest. 1985 Jan;87(1 Suppl):50S-54S. doi: 10.1378/chest.87.1.50s.Chest. 1985.PMID: 3880531Review.