Comparison of the effectiveness of combination of fennel extract/vitamin E with ibuprofen on the pain intensity in students with primary dysmenorrhea. - Nasehi, Masoomeh; Sehhatie, Fahimeh; Zamanzadeh, Vahid; Delazar, Abbase; Javadzadeh, Yousef; Chongheralu, Bahman Mohammady (Iranian Journal of Nursing & Midwifery Research, 2013)