1. Literature has been grouped in reference lists of several chapters in those cases where arguments are difficult to entangle or published over several articles or books. In cases of citation the article or book involved is indicated by the reference number together with a capital Arabic letter
2. Hentzepeter-van Ravensberg HD (2008) Zwangerfit. Bohn Stafleu van Loghum, Houten
3. Haslam J (2008) Historical perspective of pelvic floor muscle training. In: Haslam J, Laycock J (eds) Therapeutic management of incontinence and pelvic pain. Springer, London, pp 85–88
4. Versprille-Fischer ES (1995) Begeleiding van patiënten met bekkenbodem-disfunctie. Elsevier Gezondheidszorg, Maarssen
5. Chase JW et al (2004) Functional constipation in children: urotherapy and bowl dysfunction. J Urol 71:2641–2643