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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1988 1
1990 1
2013 2
2014 1
2021 2
2022 2
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Witnessed versus unwitnessed random urine tests in the treatment of opioid dependence.
Mallya A, Purnell AL, Svrakic DM, Lovell AM, Freedland KE, Gott BM, Sayuk GS, Cicero TJ, Brawer PA, Trafton JA, Scherrer JF, Lustman PJ. Mallya A, et al. Among authors: purnell al. Am J Addict. 2013 Mar-Apr;22(2):175-7. doi: 10.1111/j.1521-0391.2013.00326.x. Am J Addict. 2013. PMID: 23414505 Free PMC article.