Peoples' Friendship University of Russia (RUDN), University College London, University of Leicester, University College London, Radboud University Nijmegen - Radboud Center for Infectious Diseases (RCI), Utrecht University - Julius Center for Health Sciences and Primary Care, University College London, University of Leicester - Department of Respiratory Sciences, Government of the United Kingdom - Chelsea and Westminster Hospital NHS Foundation Trust, University College London, Bart's Health NHS Trust - The Royal London Hospital, National Institute for Public Health and the Environment (RIVM), University College London, School of Life and Medical Sciences, Faculty of Medical Sciences, Division of Medicine, UCL Respiratory and Government of the United Kingdom - Department of Respiratory Medicine