vertically vibrating instrument to inject tattoo pigment 50 to 3,000 times per minute up to or into the dermis at a depth of 1/64th to 1/16th of an inch" (Armstrong & Pace Murphy, 1997 ...
The Armstrong Tattoo Attitude Survey (ATTAS ... several sets of Likert-type scales with a choice range of 1 (low agreement) to 5 (strong agreement) were included in the survey.
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