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Chopp M, Tidwell CD, Lee YJ, Knight R, Helpern JA, Welch KM.Chopp M, et al. Among authors: welch km.Stroke. 1989 Oct;20(10):1357-60. doi: 10.1161/01.str.20.10.1357.Stroke. 1989.PMID: 2799866
Chopp M, Welch KM, Tidwell CD, Helpern JA.Chopp M, et al. Among authors: welch km.Stroke. 1988 Nov;19(11):1383-7. doi: 10.1161/01.str.19.11.1383.Stroke. 1988.PMID: 3188123
Chopp M, Welch KM, Tidwell CD, Knight R, Helpern JA.Chopp M, et al. Among authors: welch km.Stroke. 1988 Dec;19(12):1521-5. doi: 10.1161/01.str.19.12.1521.Stroke. 1988.PMID: 3201511