Development and validation of questionnaire/scale to assess problematic online dating app (ODA) use in a sub-cohort of the SwissPrEPared cohort study (validation sample: n=229). Longitudinal design to assess the association of problematic ODA use and sexual/mental health and substance use outcomes. No randomised trial, only 1 cohort which will be stratified according to severity/risk of problematic ODA use.
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Inclusion Criteria: * currently engaging in online dating (i.e., using applications/websites with the aim to meet potential relationship or sexual partners or having used them actively in the past 12 months) * Participating in the SwissPrEPared study at center Checkpoint Zurich * German speaking Exclusion Criteria: \- Potential participants will be excluded if they are unable to follow study procedures. For Inclusion/Exclusion at the SwissPrEPared study see: NCT03893188 at clinicaltrials.gov