Study population
All students in the last year of the preclinical cycle of medical studies of the Université Paris-Cité Medical School in 2020–2021 (1,002 students) were eligible for the study. The entire 2020–2021 class was divided into several groups by the medical school by alphabetical order to further distribute the students to different traineeships. The intervention group was one of such pre-established groups (20 students) and the rest constituted the control group. No student refused to participate in the study.