BMJ Publishing Group, BMJ, 6686(298), p. 1519-1519, 1989
DOI: 10.1136/bmj.298.6686.1519-c
BMJ Publishing Group, BMJ, 6681(298), p. 1182-1183, 1989
DOI: 10.1136/bmj.298.6681.1182-d
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