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Abdominal pain related to adulterated opium: An emerging issue in drug addicts. 

Vahabzadeh M, Mégarbane B. 

World J Psychiatry. 2020;10(5):95‐100. Published 2020 May 19. doi:10.5498/wjp.v10.i5.95

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7243618/