Journal Article Quality assurance of medical care Get access Nick Black Nick Black Senior Lecturer in Public Health Medicine Health Services Research Unit, Department of Public Health and Policy, London School of Hygiene and Tropical MedicineKeppel Street, London WC1E 7HT Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Public Health, Volume 12, Issue 2, 1990, Pages 97–104, https://doi.org/10.1093/oxfordjournals.pubmed.a042538 Published: 01 May 1990
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Nick Black (1990) studied this question.