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Lankisch PG, Tönnis HJ, Fernandez-Redo E, Girndt J, Kramer P, Quellhorst E, Scheler F.Lankisch PG, et al.Br Med J. 1973 Dec 22;4(5894):712-3. doi: 10.1136/bmj.4.5894.712.Br Med J. 1973.PMID: 4204673Free PMC article.