Peran n-acetylcysteine dosis tinggi jangka pendek pada perubahan klinis dan kadar protein C-reaktif penderita penyakit paru obstruksi kronik eksaserbasi akut di RSUD dr. Moewardi Surakarta = The role of high-dose short course n-acetlylcsteine in clinical improvement and C - reactive protein?s patients with exacerbations of chronic obstructive pulmonary disease at Moewardi hospital, Surakarta