Leppilahti M, Sairanen J, Tammela TL et al. Prevalence of clinically confirmed interstitial cystitis in women: a population based study in Finland. J Urol 2005;174(2):581-3. van de Merwe JP, Nordling J, Bouchelouche P et al. Diagnostic criteria, classification, and nomenclature for painful bladder syndrome/interstitial cystitis: an ESSIC proposal. Eur Urol 2008;53(1):60-7. Ottem DP, Teichman JM. What is the value of cystoscopy with hydrodistension for interstitial cystitis? Urology 2005;66(3):494-9. van Ophoven A, Hertle L. Long-term results of amitriptyline treatment for interstitial cystitis. J Urol 2005;174(5):1837-40. van Ophoven A, Oberpenning F, Hertle L. Long-term results of trigone-preserving orthotopic substitution enterocystoplasty for interstitial cystitis. J Urol 2002;167(2 Pt 1):603-7.