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Critchley EM, Clark DB, Wikler A.Critchley EM, et al.Trans Am Neurol Assoc. 1967;92:132-7.Trans Am Neurol Assoc. 1967.PMID: 4255726No abstract available.
Critchley EM, Nicholson JT, Betts JJ, Weatherall DJ.Critchley EM, et al.Postgrad Med J. 1970 Dec;46(542):698-701. doi: 10.1136/pgmj.46.542.698.Postgrad Med J. 1970.PMID: 5492702Free PMC article.
Betts JJ, Nicholson JT, Critchley EM.Betts JJ, et al. Among authors: critchley em.Postgrad Med J. 1970 Dec;46(542):702-7. doi: 10.1136/pgmj.46.542.702.Postgrad Med J. 1970.PMID: 5492703Free PMC article.