Figure 1

A typical question screen proposed to the experts during the completion of the questionnaire. The computer application provided epidemic curves to experts with an associated user-friendly slider (purple color, bottom left), the latter, with its two extreme handles, enabling experts to easily position the corresponding beginning and end of the outbreak. Just above the slider, a bar plot displaying the distribution of the answers collected at the previous round is provided as a feedback, with the own answer of the expert highlighted in a different (green) colour. The right part of the Internet page displays guiding information.