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| Women are experienced in use of a Natural Family Planning method |
| Married or in a stable relationship |
| Age: 18-40 |
| Having at least one menses after cessation of breastfeeding or after delivery |
| No use of drugs or hormonal medications that could affect fertility |
| Couples have no history of fertility problems or disorders that might cause subfertility |
| Not mixing unprotected and protected intercourse |
