Ecto-nucleotidases Activities in the Contents of Ovarian Endometriomas: Potential Biomarkers of Endometriosis oleh Laura Texidó, Claudia Romero, August Vidal, José García-Valero, M. Eulalia Fernández Montoli, Núria Baixeras, Enric Condom, Jordi Ponce, Amparo García-Tejedor, Mireia Martín-Satué