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"Gold standard" is an appropriate term.

E Versi, E. Versi, 1992, BMJ.

Variations in levator ani volume and geometry in women: the application of MR based 3D reconstruction in evaluating pelvic floor dysfunction.

R Kikinis, C Mamisch, J R Fielding, 2001, Archivos espanoles de urologia.

Skin Collagen Changes in Postmenopausal Women Receiving Different Regimens of Estrogen Therapy

J. Studd, A. Magos, E Versi, 1987, Obstetrics and gynecology.

MR imaging of pelvic floor continence mechanisms in the supine and sitting positions.

F A Jolesz, J R Fielding, R V Mulkern, 1998, AJR. American journal of roentgenology.