Profil serum petanda biologik : Interleukin-6, Tumor Necrosis Factor-alpha, Matrix Metalloproteinase-2 dan Vascular Endothelial Growth Factor pada berbagai derajat Endometriosis = The serum biomarkers profiles of Interleukin-6, Tumor Necrosis Factor-alpha, Matrix Metalloproteinase-2 and Vascular Endothelial Growth Factor in Endometriosis staging