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The Ratio of Second and Fourth Digit Length: A Biomarker for Methamphetamine Dependence? 

Kim Y, Won SD, Kwon H, Han C. 

Clin Psychopharmacol Neurosci. 2022 Nov 30;20(4):694-700. doi: 10.9758/cpn.2022.20.4.694. PMID: 36263644; PMCID: PMC9606433.

https://www.cpn.or.kr/journal/view.html?volume=20&number=4&spage=694