Butalbital/Creatinine &#x7C; Urine &#x7C; Drug toxicology
butalbital/creatinine &#x7c; urine &#x7c; drug toxicology
Butalbital/Creatinine &#x7C; Urine &#x7C; Drug toxicology
butalbital/creatinine &#x7c; urine &#x7c; drug toxicology