Analysis population
As analysis populations, the two common populations of intention-to-treat and per-protocol are defined and used. The intention-to-treat population considers all patients as randomized regardless of whether they finished the whole survey procedure. Criteria for determining the per-protocol population are as follows: patients who stayed in their randomized group, answered the first questionnaire before the decision-making (and for IG: after the intervention), and answered the second questionnaire within the timeframe of 1–4 weeks after the treatment decision.