Before potential respondents could start the questionnaire, they had the opportunity to read an information letter which explained the purpose of the project and the questionnaire, the procedure, the confidentiality, etc. Subsequently, respondents could tick a box if they agreed to participate in the online questionnaire. When respondents ticked the box (i.e., gave their consent), they could start filling in the questionnaire. Below, you can find the information letter, provided in five languages.