Answer: a) Retrospective cohort study
B) Relative risk C) 3.1
The cholesterol level measured in 1992 is a valid determinant of exposure status during the entire study period.
Certain ones do it depends i hope this help
The time it takes for dissolvable or absorbable stitches to disappear can vary. Most types should start to dissolve or fall out within a week or two, although it may be a few weeks before they disappear completely. Some may last for several months.
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