Department for Evidence-Based Medicine and Evaluation, Danube University Krems, Krems an der Donau, Austria. Karl Landsteiner University of Health Sciences, Krems an der Donau, Austria. Poznan University of Medical Sciences, Poznan, Poland. Department of Pediatrics, Lund University, Lund, Sweden. University Hospital and School of Medicine, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. School of Medicine, Milwaukee Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America. Library & ICT, Faculty of Medicine, Lund University, Lund, Sweden. Eppi-Centre, Institute of Education, University College London, London, United Kingdom. Cochrane Sweden, Research and Development, Skåne University Hospital, Lund, Sweden.