Immunohistochemical expression of matrix metalloproteinases, their tissue inhibitors, and cathepsin-D in ovarian endometriosis: correlation with severity of disease - Protopapas, Athanasios; Markaki, Sophia; Mitsis, Theodoros; Milingos, Dimitrios; Athanasiou, Stavros; Haidopoulos, Dimitrios; Loutradis, Dimitrios; Antsaklis, Aris (Fertility & Sterility, 2010)