Study	Reason for exclusion
Morgante 1999	This trial was excluded because all the patient received triptorelin for 6 months post‐surgery before randomisation to danazol or no treatment.
Schindler 1998	This is a prospective multi centre phase three study published in German. Preliminary translation suggests however that treatment was not randomly assigned.
Vercellini 2003	This is a pilot study using the levonorgestrel‐releasing intrauterine system for treatment of endometriosis post‐surgery. This is a locally effective hormonal suppressive therapy and has low systemic effects.
Ylanen 2003	This is a dose finding study with no comparison of treatment modality with placebo or no treatment.