1. Prognosis in four syndromes of pregnancy-related pelvic pain;Albert;Acta Obstet Gynecol Scand,2001
2. A prospective study of low back pain in a general population. II. Location, character, aggravating and relieving factors;Biering-Sorensen;Scand J Rehabil Med,1983
3. Pelvic girdle pain in pregnancy: the impact of parity;Bjelland;Am J Obstet Gynecol,2010
4. Mode of delivery and persistence of pelvic girdle syndrome 6 months postpartum;Bjelland;Am J Obstet Gynecol,2013
5. Quality of Life. The assessment, analysis and interpretation of patient-reported outcomes;Fayers,2007