RT Journal Article SR Electronic T1 Review: minor analgesics are effective for primary dysmenorrhoea JF Evidence Based Nursing JO Evid Based Nurs FD BMJ Publishing Group Ltd and RCN Publishing Company Ltd SP 81 OP 81 DO 10.1136/ebn.2.3.81 VO 2 IS 3 YR 1999 UL http://ebn.bmj.com/content/2/3/81.abstract AB