BMJ Publishing Group, BMJ, 6670(298), p. 383-383, 1989
DOI: 10.1136/bmj.298.6670.383-b
BMJ Publishing Group, BMJ, 6665(298), p. 26-26, 1989
BMJ Publishing Group, BMJ, 6670(298), p. 383-383, 1989
DOI: 10.1136/bmj.298.6670.383-a
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