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Keystone JS, Krajden S, Warren MR.Keystone JS, et al.Can Med Assoc J. 1978 Aug 12;119(3):241-2, 247-8.Can Med Assoc J. 1978.PMID: 679128Free PMC article.
Krajden S, Panisko DM, Tobe B, Yang J, Keystone JS.Krajden S, et al. Among authors: keystone js.Trans R Soc Trop Med Hyg. 1991 Nov-Dec;85(6):731-2. doi: 10.1016/0035-9203(91)90434-z.Trans R Soc Trop Med Hyg. 1991.PMID: 1801338No abstract available.
Keystone JS, Yang J, Grisdale D, Harrington M, Pillon L, Andreychuk R.Keystone JS, et al.Can Med Assoc J. 1984 Oct 1;131(7):733-5.Can Med Assoc J. 1984.PMID: 6478361Free PMC article.
Yang J, Keystone JS, McIntyre L, Spence H.Yang J, et al. Among authors: keystone js.Can Vet J. 1982 Apr;23(4):126-8.Can Vet J. 1982.PMID: 17422128Free PMC article.
Proctor EM, Wong Q, Yang J, Keystone JS.Proctor EM, et al. Among authors: keystone js.Am J Trop Med Hyg. 1987 Sep;37(2):296-301. doi: 10.4269/ajtmh.1987.37.296.Am J Trop Med Hyg. 1987.PMID: 2889385