NIHR Health Protection Research Unit (HPRU) in Emerging and Zoonotic Infections, Institute of Infection, Veterinary and Ecological Science, University of Liverpool AND Division of Neurology, Walton Centre NHS Foundation Trust, Liverpool, L9 7LJ
Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA