Estrogen and progesterone receptors in endometriotic tissue and endometrium: comparison according to localization and recurrence**Supported by grant B91-17X-09511-01A from the Swedish Medical Research Council, Stockholm; by the Medical Faculty, University of Lund, and the John and Augusta Persson Foundation, Lund; and by the Malmö General Hospital Foundation, and the Malmö General Hospital Cancer Foundation, Malmö, Sweden.