Postal questionnaires
Additional and up-to-date data on reproductive intentions and outcomes
were derived from postal questionnaires. All patients were sent an
information letter and informed consent form for participating in the
questionnaire. The questionnaire addressed the desire for parenthood,
attempts to conceive, fertility problems, obstetric and neonatal
outcomes. Three and four weeks after sending the initial invitation,
respondents received a reminder asking them to participate. Deceased or
severely ill patients were excluded from receiving the questionnaire.