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A multistage, stratified, cluster sampling was recruited.
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Between January 2013 and October 2013, 245 participants undergoing NP brush sampling were recruited in this study.
A convenience sample was recruited through two large ID services.
A self-selected Internet sample was recruited via Facebook.
Sample was recruited during the years of 2005 and 2006.
Fourth, to enhance generalizability, a community sample (versus undergraduates or a purely clinical sample) was recruited.
The sample was recruited by convenience, using a snowballing sampling technique for data collection.
A community sample was recruited to establish a comparison group (n = 152).
The control sample was recruited by online advertisement or via contacts of the researchers.
A convenience sample was recruited from a major southeastern US university using extra class credit as participation incentive.
The first sample was recruited in a suburban context (n = 265; 62% girls) and the second sample in an urban setting (n = 136; 61% girls).
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