Oral evening primrose oil: its effect on length of pregnancy and selected intrapartum outcomes in low-risk nulliparous women.
J Nurse Midwifery. 1999 May-Jun;44(3):320-4. doi: 10.1016/s0091-2182(99)00055-5.
J Nurse Midwifery. 1999.
PMID: 10380450