Comparing the analgesic effect of heat patch containing iron chip and ibuprofen for primary dysmenorrhea: a randomized controlled trial. - Rigi, Shahindokht Navvabi; kermansaravi, Fatihe; Navidian, Ali; Safabakhsh, Leila; Safarzadeh, Ameneh; Khazaian, Somaye; Shafie, Shahla; Salehian, Tahmineh (BMC Women's Health, 2012)