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Muhammad Farhan Maulana, Lalu Srigede, Lale Budi Kusuma Dewi and Ari Khusuma 2026. Urine Analysis Based on Sampling Time in Tramadol Abusers. Journal of Indonesia Laboratory Students (JILTS). 5, 2 (Oct. 2026). DOI:https://doi.org/10.32807/jilts.v5i2.492.