Studi deteksi 8-hidroksi-2'-deoksiguanosin dan 1-hidroksipiren dalam urin sebagai biomarker risiko kanker akibat paparan polycyclic aromatic hydrocarbon dari asap kebakaran hutan di Dumai = Study of urinary 8-hydroxy-2'-deoxyguanosin and 1-hydroxypyrene detection as biomarkers of cancer risk due to polycyclic aromatic hydrocarbon exposure from woodsmoke of forest fire In Dumai