We compared rates of alanine aminotransferase ( ALT ) elevationgrade @ ( ALT@ @ times the upper limit of normal ) and graded bilirubin elevations in HIV-negative opioid injectors randomized to long-term ( @ weeks ) or short-term ( @ days ) medication assisted treatment ( LT-MAT and ST-MAT , respectively ) with BUP/NX in a multisite trial conducted in China and Thailand .