Hagen, Suzanne, Hanley, Janet and Capewell, Ann (2002) Test-retest reliability, validity and sensitivity to change of the urogenital distress inventory and the incontinence impact questionnaire. Neurourology and Urodynamics, 21 (6). pp. 534-539. ISSN 0733-2467

Hanley, Janet, Capewell, Ann and Hagen, Suzanne (2001) Validity study of the severity index, a simple measure of urinary incontinence in women. BMJ, 322 (7294). pp. 1096-1097. ISSN 0959-8138