1.
Questionnaire on knowledge and illness perception.
2.
Questionnaire on risk behaviour.
S1 Protocol -
S2 Protocol -
S3 Protocol -
S1 File -
Additional file 1 of Lifestyle changes during the first wave of the COVID-19 pandemic: a cross-sectional survey in the Netherlands
Additional file 1 of Vaping during the COVID-19 lockdown period in Belgium
Questionnaire (principal) investigators (Dutch).
Questionnaire MRECs (Dutch).