Perceived Stress Scale (PSS) [
We used the 10-item version of this instrument (PSS-10) with a 5-point Likert response scale going from 1 “Never” to 5 “Very often”. We asked the participants to evaluate their experiences during the past week. Sample items: “…have you felt that you were unable to control the important things in your life?”, “…have you felt difficulties were piling up so high that you could not overcome them?”