Recommendations by the Urogynecology Working Group for sonography of the lower urinary tract within the scope of urogynecologic functional diagnosis. - Schär,G.N.; Kölbl,H.; Voigt,R.; Merz,E.; Anthuber,C.; Niemeyer,R.; Ralph,G.; Bader,W.; Fink,D.; Grischke,E.; Hanzal,E.; Kochli,O.R.; et al. (Ultraschall Med, 1996)