Hanna Heckendorf

Efficacy of an internet and app-based gratitude intervention in reducing repetitive negative thinking and mechanisms of change in the intervention's effect on anxiety and depression: Results from a randomized controlled trial.

Dirk Lehr, David Daniel Ebert, D. Ebert, 2019, Behaviour research and therapy.

Effectiveness of an Internet-Based Self-Help Intervention versus Public Mental Health Advice to Reduce Worry during the COVID-19 Pandemic: A Pragmatic, Parallel-Group, Randomized Controlled Trial

D. Lehr, L. Boß, Hanna Heckendorf, 2022, Psychotherapy and Psychosomatics.

Are web-based stress management interventions effective as an indirect treatment for depression? An individual participant data meta-analysis of six randomised trials

D. Lehr, C. Buntrock, Hanna Heckendorf, 2024, BMJ mental health.