Prolonged use of oral contraception before a planned pregnancy is associated with a decreased risk of delayed conception. Farrow A, Hull MGR, Northstone K, et al. J Hum Reprod 2002; 17: 2754-2761
Prolonged use of oral contraception before a planned pregnancy is associated with a decreased risk of delayed conception. Farrow A, Hull MGR, Northstone K, et al. J Hum Reprod 2002; 17: 2754-2761