Bartosz Helfer is a Postdoctoral Research Associate at Faculty of Medicine, Imperial College London, UK. He studied evidence-based psychiatry at Technical University in Munich, Germany. Dr Helfer received his PhD in developmental psychopathology at the Institute of Psychiatry, Psychology & Neuroscience, King’s College London, UK with clinical placements at the Maudsley Hospital. Apart from systematic reviews and their methodology, his area of special interest is meta-research, which investigates research methods and practices to understand how to reduce biases in science and thereby deliver more reliable and secure conclusions from scientific studies.