Partner bereavement and detection of dementia: a UK-based cohort study using routine 1 health data Manuscript Number: 19-0571R2 Author(s): Krishnan Bhaskaran, Harriet J. Forbes, Sinéad M. Langan, Caroline Morton, Marcus Richards, Sigrun A.J. Schmidt, Liam Smeeth, Charlotte Warren-Gash, Angel Y.S. Wong