3United Nations, Population Division.World Contraceptive Use 2007. New York: United Nations Dept. for Economic and Social Affairs Population Division, 2008[EB/OL]. http: //www.tm.org/esa/population/publieations/contraeeptive2007/contraceptive2007, 2008.
4Higham JM, O' brien PM, Show RW. Assessment of menstrual blood loss using a pictorial chart [J]. Br J Obstet Gyneco, 1 1990, 8 (97): 734-739.
5Jassen CA, Schohen PC, Heinta AP. A simple visual assessment technique to discriminate between menorrhagia and normal menstrual blood loss [J]. Obstetrics & Gynecology, 1995, 85 (6) : 977- 982.
7Brazier JE, Harper R, Jones NMB, et al. Validating the SF-36 health survey questionnaire: new outcome measure for primary care [J].BMJ, 1992, 305 (6846): 160-164.
8Garratt AM, Ruta DA, Abdalla MI, et al. The SF-36 health survey questionnaire: an outcome measure suitable for routine use within the NHS[J]. BMJ, 1993, 306 (6890): 1440-1444.
9UNDP/UNFPA/WHO/HRP. Progress in Reproductive Health Research[J], progress, 2002, 60: 1-7.
10Thonneau P, Goulard H, Goyaux N. Risk factors for intrauterine device failure: a review [J], Contraception, 2001, 64 (1): 33- 37.
