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. 1990 Apr 14;300(6730):991–993. doi: 10.1136/bmj.300.6730.991
Retrospective review of hospital patient records.
J G Williams
1, M J Kingham
1, J M Morgan
1, A B Davies
1
J G Williams
1School of Postgraduate Studies in Medical Health Care, Morriston Hospital, Swansea.
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M J Kingham
1School of Postgraduate Studies in Medical Health Care, Morriston Hospital, Swansea.
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J M Morgan
1School of Postgraduate Studies in Medical Health Care, Morriston Hospital, Swansea.
Find articles by J M Morgan
A B Davies
1School of Postgraduate Studies in Medical Health Care, Morriston Hospital, Swansea.
Find articles by A B Davies
1School of Postgraduate Studies in Medical Health Care, Morriston Hospital, Swansea.
PMCID: PMC1662713 PMID: 2344510