<br>        Inclusion Criteria:<br><br>          -  Women over 18 years with endometriosis-associated pain, like dysmenorrhea,<br>             dyspareunia, lower abdominal pain, low-back pain, rectal pain, defecation pain (only<br>             one criterion needs to be fulfilled for study inclusion);<br><br>          -  Participants are in good general health except for endometriosis related problems;<br><br>          -  Except for endometriosis, no existence of an obvious diseases which could cause<br>             chronic pain or which could cause abdominal pain;<br><br>          -  The participant must have a desire to have children;<br><br>          -  Participants must be able to give their consent and must understand the risks<br>             associated with a participation in the study;<br><br>          -  There must be a signed and dated informed consent which was accepted by the local<br>             ethic committee<br><br>        Exclusion Criteria:<br><br>          -  Existent pregnancy including ectopic pregnancy;<br><br>          -  Identification of other causes for the discomfort;<br><br>          -  Chronic diseases, except endometriosis, which require continuous pain therapy;<br><br>          -  Previous application of GnRH analogues 6 month prior to study;<br><br>          -  Concurrent use of systemic corticosteroids, antineoplastic agents and/or radiation;<br><br>          -  Planned additional general surgical procedures during the operation for removal of<br>             the endometriotic lesions;<br><br>          -  Absence of endometriosis at laparoscopy;<br><br>          -  Partial resection of the bowel or urinary bladder for removal of endometriosis<br>      ;<br>        Inclusion Criteria:<br><br>          -  Women over 18 years with endometriosis-associated pain, like dysmenorrhea,<br>             dyspareunia, lower abdominal pain, low-back pain, rectal pain, defecation pain (only<br>             one criterion needs to be fulfilled for study inclusion);<br><br>          -  Participants are in good general health except for endometriosis related problems;<br><br>          -  Except for endometriosis, no existence of an obvious diseases which could cause<br>             chronic pain or which could cause abdominal pain;<br><br>          -  The participant must have a desire to have children;<br><br>          -  Participants must be able to give their consent and must understand the risks<br>             associated with a participation in the study;<br><br>          -  There must be a signed and dated informed consent which was accepted by the local<br>             ethic committee<br><br>        Exclusion Criteria:<br><br>          -  Existent pregnancy including ectopic pregnancy;<br><br>          -  Identification of other causes for the discomfort;<br><br>          -  Chronic diseases, except endometriosis, which require continuous pain therapy;<br><br>          -  Previous application of GnRH analogues 6 month prior to study;<br><br>          -  Concurrent use of systemic corticosteroids, antineoplastic agents and/or radiation;<br><br>          -  Planned additional general surgical procedures during the operation for removal of<br>             the endometriotic lesions;<br><br>          -  Absence of endometriosis at laparoscopy;<br><br>          -  Partial resection of the bowel or urinary bladder for removal of endometriosis<br>