 Part 2: Discrete choice experiment DCE A discrete choice experiment questionnaire DCE-Q will be designed based on the results of the preparatory qualitative study, incorporating all identified valued treatment characteristics. A DCE aims to identify attributes in this case treatment characteristics significantly affecting choice and trade-offs of all attributes with one attribute generally considered the most important in this case, either pregnancy rate or safety Dancet et al., 2013, depending on the insights gathered by the qualitative study. 