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Ho A, Leung R, Lai CK, Chan TH, Chan CH.Ho A, et al. Among authors: chan th, chan ch.Respiration. 1997;64(3):224-8. doi: 10.1159/000196675.Respiration. 1997.PMID: 9154675Clinical Trial.
Lai CK, Chan CH, Ho SS, Hui AC, Lai KN.Lai CK, et al. Among authors: chan ch.Chest. 1995 Jul;108(1):36-40. doi: 10.1378/chest.108.1.36.Chest. 1995.PMID: 7606988Clinical Trial.
Lai KN, Ho RT, Lai CK, Chan CH, Li PK.Lai KN, et al. Among authors: chan ch.Clin Exp Immunol. 1994 Apr;96(1):116-21. doi: 10.1111/j.1365-2249.1994.tb06240.x.Clin Exp Immunol. 1994.PMID: 7908616Free PMC article.