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Subject
- 131 Surgery
- 126 Clinical trial
- 112 Pathology
- 109 Child
- 105 Aged, 80 and over
- 105 Prospective studies
- 102 Prospective study
- 97 Procedures
- 95 Mortality
- 94 Prevalence
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Date issued
- 54 2020 - 2021
- 559 2010 - 2019
- 290 2000 - 2009
- 7 1997 - 1999