Answer: Interventional Study
Explanation: When a treatment group is compared to standard (control) group it is called Interventional Study
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Solution:
The most appropiate unit of measurement fro most types of cells is CD4 counts are measured in cells per cubic millimetre = cells/mm3. A cubic millimetre (mm3) = mm3 = 1 mm x 1 mm x 1 mm.
This is the required answer.
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