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The _______ shown in the accompanying figure is only visible if nonprinting characters are turned on.
Early Signs
Initial indicators or symptoms that may suggest the development or presence of a disease or condition.
Experimental Study
A study method that involves manipulating variables to determine cause and effect relationships.
Cure Rates
The percentage of people who are considered completely free of a particular disease after undergoing treatment.
Double-Masked Design
Experimental procedure in which neither the participant nor the experimenter knows whether the participant has received the experimental treatment or a placebo.
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