Kjøllesdal Møyfrid, Nielsen Sven, Stjerndahl Jan-Henrik, Ellström Engh Marie A
Department of Obstetrics and Gynecology, Sykehuset Innlandet Health Authority, 2407 Elverum, Norway.
Acta Obstet Gynecol Scand. 2005 Aug;84(8):823-4. doi: 10.1111/j.0001-6349.2005.0498d.x.