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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1992 4
1993 1
1994 1
1997 1
2008 1
2019 1
2022 1
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Page 1
Patient-controlled analgesia.
Beeton AG, Upton PM, Shipton EA. Beeton AG, et al. Among authors: upton pm. S Afr Med J. 1992 Jan 18;81(2):58. S Afr Med J. 1992. PMID: 1733021 No abstract available.