Acknowledgements
The authors are grateful to the Rijksinstituut voor ziekte-en invaliditeitsverzekering/Institut national d'assurance maladie-invalidité for permission to use their data regarding the incidence of sterilisation and reversal procedures. They are also indebted to Mr Patrick Rouckhout for the provision of valuable information.
Declaration of interest:The authors report no conflict of interest. The authors alone are responsible for the content and the writing of the paper.